Context for those unaware:
"A friend of mine" OP is referring to Call Me Leni, who was banned from several instances and communities for being a KiwiFarms member, among other things, and OP has a grudge against the Fediverse for this. Leni shouldn't have linked their KiwiFarms posts on Lemmy, and linked Lemmy threads talking about them on their KiwiFarms account. That wasn't very bright of them.
Call me Leni also defended KiwiFarms as a "free speech" site and tried to conflate the hate site with Discord:
I take it OP feels like the Fediverse is violating "free speech" for banning KiwiFarms members.
Yeah, the whole point of the Fediverse is it's decentralized. Each instance has its own independent administrators so if you come across an instance you don't like, you can just post to another one. Lemmy isn't just one site but hundreds of sites that communicate together.