How the fuck they decide what is a burner vs a phone owned by people who don't like getting raped by the likes of AT&T is beyond me.
Edit: Per suggestion below, one option is textverified.com. I have verified this works. You can pay with crypto. As little as 75c
I used IRC decades ago, and even back then the "large rooms" had power-tripping gatekeepers that banned people willy-nilly. Some things never change.