Cross-posting is marketing for the source platform, so you shouldn't be surprised I don't think Twitter to Mastodon cross-posting is beneficial to Mastodon.
Mastodon is a social network, and talking to each other is a big part of it. If someone has setup a cross-poster and left and never checks their notifications, it's pointless for us who are here.
@Gargron So I left Twitter. 😅
@Gargron OMG. Agreed!! It looks hella spammy to me...😏😏🙄
@gargron Can you block cross-posters without breaking OStatus or ActivityPub?
@starbreaker @Gargron many twitter clients added features to mute via source (e.g. via "Facebook" or "YouTube" or "Twitter for Android" or whatever)
@Gargron I mainly publish here. But sometimes I like to share what I see elsewhere. That's why I x-post my RT from Twitter.
This is for me a way to credit the source of things I share.
It also has the effect of slowing down my RT habits, because I know that they will be posted here. So I only RT things that I thing are worth being posted also on #mastodon. What's you opinion? Do you think this is still promoting the source platform? Should I remove all reference and credits to original posts?
@Gargron why not let us post from Mastodon to say Twitter with a link at the end permalink to the original said post? Then we only have to post once but invites people to see the full conversation and join in.
@Gargron how about Mastodon to Twitter (or whatever SNS?)
@Gargron I always wonder, what service do rt cross posters think they are doing for us?
There's people who ONLY cross post RTs. How is that going to help us?
@Gargron It's superfluous. If I want to know what someone posts on Twitter (or Facebook) I can follow them there. The reason for having several distinct social media platforms is precisely to not see the same content (or people) on all of them.
@Gargron you could also view a cross-post as the result of a remote follow from a different platform...
... in the fediverse, the majority of posts may eventually turn out to be crossposts in that sense.
I agree it should not be thoughtless!
@Gargron totally agree ...
@Gargron I think a built-in cross-posting would be ugly. While we could say that Mastodon is somewhat inspired by Twitter, what I like most about it is that it has custom terminology, custom design and different principles.
I think of Mastodon as a decentralised microblogging platform that has its own philosophy. It deserves and has earned to be thought of as something separate, good in itself, as something determinedly different, more sophisticated than just a ''Twitter clone''
🇬🇧 @Gargron IS crossposting from Mastodon to closed-source platform better for Mastodon than staying alone with Mastodon and closing ones account on these other platforms? I'd answer, YES. I'm cross-posting my toots to Facebook using IFTTT, my followers there keep using the platform they like, Facebook that is, and I am not forcing them to migrate to Mastodon. Their right after all. I go there to see reactions, from time to time, also my right after all.
@Gargron see this @nextcloud
@Gargron i treat twitter as just another instance. i dont see it as advertising to crosspost from twitter to mastodon. its a shame twitter and mastodon cant talk at all. i wonder if there is a way to do this without adding twitter api gunk to mastodon.
@Gargron that heavily depends on use case imho. For example, i can't tell all the users my instance potentially targets to "drop everything you're using and move to mastodon" as there are no main content providers there yet. On the other hand, providers will not move if there are no readers.
The only reasonable solution (?) is to provide them a cross-posting tool to fill the timeline with valuable content and then, try to convince regular users to join and follow.
@Gargron but that should definitely be kept out of Mastodon core and not to be an ultimate goal. Rather a temporary solution for new and empty instances.
Follow-up to this: Since the cross-poster apps are indistinguishable from other apps, the people who set them up are considered active, and therefore would never receive the "while you were away" summaries of notifications 
So yeah, it's a problem
@Gargron Don't crossposters post from a specifically named app? I swear
in some apps I can see what someone posts from and I see crossposters' apps too.
@esp i think the problem here is that mastodon can't know which of these "apps" (each cross-posting tool has it's own app) are a cross-posting ones and which one are not.
@Gargron those crossposters would never get notifications, so save somewhere the last date that the notifications were requested, and use that for "while you were away" summaries?
@slipstream @Gargron #hardfork new API keys?
How to get this
@Gargron it's not marketing for the source platform. If you don't want people to do it, don't technically allow it. But others will, because #opensource is awesome.
@Gargron I’ve been planning a “cross-post this toot to Twitter” checkbox for my app, that seems like it would be useful though. It’s the other way around, and ideally it will be opt-in for each post.
Amine. Cross-pissing from burpslobber to here is just pollution.
If people want to share links and give credit, use the source the tweets are talking about. Tweets themselves are never the source of anything. They’re a distribution vehicle only. A spam vector. A lead generator for brands and egos. Don’t give them the credit they don’t deserve.
No excuse for xpissing from there to here.
Want to know how I really feel? ;)
@Gargron I can see this, but I'm also trying to help my friends and audience on other platforms to find me here. migration is rarely easy, no matter how or where.
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@Gargron Agreed. It somewhat irks me that some new users aren't bothering to get acquainted with the Mastodon ecosystem, but rather they use crossposters, some of which don't put content warnings.