The main point of my OP was that bsky is more vulnerable to a takeover, contrary to the ads they're putting out bragging that they're "billionaire-proof."
The problem that's referring to is the phenomenon of a communication tool attaining enough network effect, then getting hijacked. That could still be a problem on fedi if the market is concentrated in too few servers.
And let's not forget when W3C's specs didn't magically force Microsoft to behave.