Can you name anyone who was in ostensibly favor of free speech, and then, when given the opportunity to censor people, didn't seize it?

The obvious example would be Elon, the "free speech absolutist" whose principles only lasted about a week from taking over Twitter. On a smaller scale, you can see this play out with Reddit mods on individual subreddits for just about anyone on the political spectrum.

I suppose you could generalize my statement to "power corrupts", but the idea is the same.