Try it from GV. My hunch is that the filter is set up for outbound SMS that come from VoIP numbers. Reason: both TNO’s blog post and jmp.chat reports of censorship stem from Mysudo and jmp.chat users, not regular carriers.

The message sending “bad” words came from T-mobile or GV?

Seems to affect VoIP carriers, I reckon.

Nice, didn’t know. Do you mind linking me to this feature? Maybe a tutorial on how to enable it?

Matrix isn’t decentralized, it’s federated.