Of course, a hallmark of a decentralized network is that there is no central authority that could actually do that. Implicitly, this demand is a rejection of the very concept of decentralization.
What, you can absolutely ban people on a decentralised network. You may not be able to expunge someone from a part of the network they control themselves, but you can expunge them from the part you control. Bluesky has this power and has used it in the past.
AnyOldName3@lemmy.world 5 days ago
If you’re the kind of person who wants a particular person banned, you probably want to be on the kind of instance that would ban them, and then from your perspective, they’d be banned, so you’d never have to see their posts. It still being possible to interact with them from other instances isn’t any more of a big deal than it being possible to interact with them on an entirely different website after they’re banned from regular social media - no one can ban someone from the whole Internet.
General_Effort@lemmy.world 5 days ago
Yes. On Bluesky, they could be individually muted or blocked. You can make and share blocklists, make your own custom feeds that exclude such posters, or even create your own moderation service that removes (or blurs, …) posts for your subscribers. Obviously, that is not satisfactory for some people.