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The Mastodon archipelago does have a "this is a nice neighbourhood, and we like to keep it that way" aura to it.
However that is not necessarily a bad thing, or a good thing.
Ages ago I made an "entropy law" for online communities, that eventually they all end up in nazi propaganda and Viagra spam.
Any community always balance on the edge. Sooner or later it will fall over, and rarely recover. It's a ongoing balance between recruitment and decay, engagement and trolling.