Whoever operates hosting can decide to ban someone from hosting. This isn't different from how Cloudflare would ban you for hosting something illegal.
Whoever operates an app can decided to ban someone from that app. This isn't different from how a forum moderator can ban you for something they don't like.
Whoever operates services in the middle may decide to ban someone for network spam/abuse, same as cloud services may do if you abuse their limits.
You can always try to host your stuff elsewhere, and you can always access the same network from another app whose decisions you prefer.
So it's basically same as usual on the internet, but each role is separate, and you can mix and match what works for you.
Exactly this, people seem to confuse decentralization with federation. The Blockchain is decentralized, the fediverse is federated, big difference. I think it's because what we actually want and need right now (with western regimes dialing up censorship and repression to eleven) is decentralized social media, but that doesn't exist yet unfortunately.
Whoever operates hosting can decide to ban someone from hosting. This isn't different from how Cloudflare would ban you for hosting something illegal.
Whoever operates an app can decided to ban someone from that app. This isn't different from how a forum moderator can ban you for something they don't like.
Whoever operates services in the middle may decide to ban someone for network spam/abuse, same as cloud services may do if you abuse their limits.
You can always try to host your stuff elsewhere, and you can always access the same network from another app whose decisions you prefer.
So it's basically same as usual on the internet, but each role is separate, and you can mix and match what works for you.