I’ve also thought of this. IMHO, it would be like a professional union, not one tied to a specific employer (so opt-in only). The job of the union would be to provide legal assistance to the employee and consult with employers who hire remote workers.

I have lots of thoughts for this, and it’s something I think about quite a bit as a remote worker. If this is something you are serious about, or just want to chat about, look me up.