Yeah, a small one that is cheaper because they'll be processing billions of messages per year.

Good thing all the kind people doing death threats won’t just bypass it?

I'm totally lost here. If you don't identify, you don't post.

Good thing no one ever breaks any rules!

If a platform decides to require an account to post, or requires your message to pass an LLM sniff test before publishing it, you can break all the rules you want but your message won't be visible to others on said platform.

The example given was a ‘lightweight LLM’ by the poster, which sounded an awful lot like client side?

If server side, you already have the heavyweight stuff going on, and yes there is no need to do all the bypassable shenanigans.

Since that client side llm would be processing billions of messages each year on each person's laptop, lol

See https://tinyllm.org

These days the name "LLM" refers more to the architecture & usage patterns than it does to the size of model (though to be fair, even the "tiny" LLMs are huge compared to any models from 10+ years ago, so it's all relative).