Compare to if Website Boy does something awful, like federating m.s with Threads. That has a huge, disproportionate impact, no question. But it also is something that can be meaningfully dissented from. You can go to a different instance. An instance admin can use a fork of Mastodon, or even something like one of the *keys. None of that is good enough, all of that has giant gulfs which can leave you in a lurch.
But it's more than you get from corporate social media, and it's not nothing.