Easy for you does not mean easy for everyone. My experience is that TLS fingerprinting paired with blocking specific user agents gets a variety of majority of bot traffic.

It's the same a basic online security: You can protect against script kiddies with basic hygiene. If the threat analysis is Mossad, then yeah, you're fucked.

Self-signed PGP is very occasionally used to prove continuity across channels or addresses. Cross-signed basically never.

In the same direction, if you can't cell the AI slop from the low-quality human output, does the source matter?

The problem is quantity. Has been for a while, the robots are only making it more obvious.

When posts fall within "acceptable" then it does not actually matter where it comes from. Logorrhea, massively offtopic, and/or shitposting are bad when humans do it. Those should suffer the same fate.

Historically it was tolerable, but has become the highest priority today because machines have cranked up the volume. If we mis-identify human garbage as robot nonsense it does not matter.

Most adults understand why men should not, generally, be hanging out in the women's clothing department. When accidental violations of those norms are pointed out, they apologize and correct. Creepers, OTOH, gonna creep.

For their own well-being, online communities should police repeated violation of social norms. Otherwise the normals leave and creepers take over.