[aine]

I prefer Matrix way - open network of different servers. Don't like spammers? OK, close registration on your server. Have public rooms? OK, block servers with open registration.

No problems with spammers or trolls at all. And that's literally my experience with 20+ homeservers that I configured

Again, nobody wants unique permanent ID per human.

PS: regarding "a new one for fee" - I hate services that work this way (hello, Blizzard), IMO.