Okay, so the next threat is a16z (a.k.a., Andreesen Horowitz).
Their investment in Towns seems malicious.
Towns, if you don't know, is a social network that's pretty much just Matrix with crypto pixie dust.
But look into what a16z does, and they've been one of the biggest funders of Big Social in existence.
Want to know why there's so many walled gardens on the Internet? Well, a16z is a big reason.
So the last threat is probably the biggest threat, and it's that developers are myopic about Mastodon to the detriment of the rest of the Fediverse.
There's lots of Mastodon clients. But most of these clients do not support the likes of Akkoma or Friendica despite both those servers having API compatibility with Mastodon.
Even worse, some of these clients don't even display messages from non-Mastodon servers.
This developer myopia actively breaks the intentions of the Fediverse.