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).
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.
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).