apps that need push notifications get problems: Google wants to force all apps on to use its proprietary service Firebase for push notifications.
That's why we need F-Droid and/or based smartphone OS without Google.

reddit.com/r/freesoftware/comm

@succfemboi
@Tutanota for example is using SSE (Server Sent Events). And afaik is @Mastodon using SSE to update their timeline in real time, too.

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