I do agree that centralization is coming to the fediverse, but not for any of the reasons that most people on here think. That centralization is coming for the exact same reasons that centralization came to email, and it's a reason that many folks that would like things to stay decentralised keep ignoring.
And that is user safety.
A lot of Mastodon fans keep pretending that Mastodon is inclusive. It's not. But it could be.