The false positives at scale problem isn't something that could be solved by an appeals process, because the problem is a step above that: a lack of continuous process improvement.

Why was the false positive generated? Why was the user unable to use the process in place to appeal? And then improve the root process cause.

This is what seems to be broken at Google and Facebook, and is the fundamental difference between a black hole support model (make problems invisible to us, because they never get to us) and one that works at scale. You're always going to have false positives, but I don't think anyone feels like the mega-corps actually have a process in place to monitor and improve the process for dealing with them.