> The difference is that Libera relies on blocking anonymous connections abusive IP ranges (proxies, gratis VPN providers). When abusers connect through Matrix, Libera only had their username, which delayed spam mitigation.

Yeah but that's not Matrix' fault. They just offer the same ability as Libera: To create an account with no validation.

Putting pressure on Matrix server providers to stop anonymous connections when they themselves provide anonymous connections is a bit too hypocritical to me. If they have a problem with the practice then just block matrix connections (as they have done). But don't complain about the practice.

Personally I love the idea of anonymous connections like on IRC and also some Matrix servers. I'm a bit sick of every single service needing me to make an 'account' these days and needing all kinds of personal info from me.