Well on fedi, the user can decide to mute an entire relay or the admin can do that as well. That is great. Dumb relays like Nostr has now has already been a spam problem. They are open doors to spam and basically easy DDOS targets

As Nostr grows, the Global view will be impossible to use. Using Nostr now in the evening is not good because most of the posts are not in English. Eventually on Nostr, relays will get overwhelmed and the Globsl Tineline will be useless and essentially a DDOS on the client.