Earlier quoted context omitted.
I totally agree, the problem is difficult however because even if we create a perfectly anonymous system for registering with social media, modern LLMs make semantic analysis trivial. It's going to be impossible to remain anonymous without also using an LLM to strip the unique footprint of your text. Which leads to a very strange and monotonous culture for internet discussions. Might be unavoidable, though, at least…
Yes this is indeed a problem. But this is even more reason to keep private conversations private. It will stop those LLMs learning your footprint from your private conversations. It's an interesting thing what you're saying. I've been thinking about this happening (I think it's inevitable) and also about using an LLM to sanitise my semantic footprint.
If you're interested in building an open source persona management suite to distribute as freedom software and level the playing field against State agents who are already building and improving such tools, I would love to find a partner to help with such a project. Even if you don't code, there are other duties besides coding involved with successfully promoting such a project and developing a community around it.