But at proto is equally open? You can also just save all of at proto.

You can save all of anything someone makes public with ATProto, ActivityPub, or RSS. You can do that with anything someone puts on a web page too, but those protocols simplify automation.

I understand why people want to be able to delete things from the internet, but it doesn't work that way. It has never worked that way. It can't work that way unless every computer is locked down to running remotely attested government-approved software, and that's obviously worse.

Once you hit publish, it's public and anyone and everyone can save a copy and distribute it. If you don't like that, don't hit publish.

ATProto won't be this way for much longer. Permissioned data is coming and will not be broadcast or accessible without grants. This will sit next to the public data, but separate.

So ATProto is about to die, in other words.

It was already wayyy too complex. And this? Yeah, they (you? sorry) really need to just give it up.