Please, read the links. They are the security and privacy experts when it comes to Android. That's their explanation of what this Android System SafetyCore actually is.
In other words, users shouldn't have to live on instances and be subjected to the whims and fancies of the admins / server operators.
Or, a less radical change would be simply to allow cross-instance interaction, i.e. your "home" instance doesn't have to host any of the content in question. You'd simply authenticate through OpenID Connect, and be able to interact as yourself on another instance.
Are you from the global south? Because it's still a common thing for SMS to be chargeable in many countries. And no one should be using SMS anyway. It's horribly insecure. At least use RCS.
To be fair, there are plenty of critical content. It's just that they use coded language to avoid the censorship. (Probably not on XHS / RedNote though? It's more of a Facebook equivalent.)
Decoupling identity from the instance is really important. It's unfortunate that that's not yet possible...
My identity = who I am. The instances are just services that I use. I should be able to use the same identity while accessing different services.