I'm beginning to think that ActivityPub will never add anti-censorship features into the core protocol (for example, independent IDs that don't live on a relay server). Because I spoke with a core developer on ActivityPub stuff a couple of years ago about the issue of servers going offline and losing your account and he said that he was working on it.

But I wouldn't be surprised if he was discouraged from continuing this work because ultimately people like ActivityPub because server admins can be little dictators that censor and ban at will.