The biggest unsolved problem is shadow banning.
Google is regulating it's traffic to suppress conservative speech,
It is quite obvious that Google hires libs and they hate conservatives, but it is very difficult to quantify. The bias tests developed by this expert: http://www.benedelman.org/hardcoding/ are now broken. They can be easily broken by google and replaced with other algorithmic biases. Worse, the regulators will not hire neutral experts but defer to political hacks. You can bet your browser that any imagined bias against any liberal or leftist site will be litigated. Worse still, the bureaucracy is full of liberals who cannot be fired.
Regulation will not solve our problems, and in the long riun it will make them worse with Google, Facebook and other giants using their public utility status to cement their monopolies.
I dunno. Seems to me a law that says "If you censor, you get a massive fine" should work pretty well.
What is the standard for proving they censored? A complaint from anyone claiming they were censored. Yes, this could be a potential nightmare for Google and other such companies, but I am willing to suffer the problems this will cause them. :)