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Not enough niche communities. Like, not even close. Example: there are communities for general Android or general gaming, but not one for Android gaming or mobile gaming.
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Harder than Reddit to sign up. There’s an extra step which is instances. So first you gotta understand what instances are, how they work, and which one is suitable for you.
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Reddit is still doing fine, or at least not bad enough for the masses to care about jumping over to Lemmy
Obviously !anime@ani.social because it’s the one with more engagement (most monthly users and most comments).
I don’t think that’s a problem really, and it isn’t much different from Reddit anyways. Have you see how many anime subreddits there are? You can scroll the list for hours. The ones with most engagement thrive, the other ones will be forgotten.