Actual FF employee here. Based on a few of the things he said, I don't believe he works here.

I was just joking.

There's a startup that's trying to do this: https://myrepp.com/. Not sure why they're not using this case as an opportunity to get some press.

I'm pretty sure they don't allow users to rate one another though as the OP is suggesting. Instead it looks like you can create an account for yourself, verify who you are, and run criminal/sex offender checks against yourself. Then you can share your Repp profile with others (when selling on Craiglist, for exampe) so that others know you aren't a psychopath (or at least not a convicted one). It wouldn't really have prevented the squatter's issue unless the squatter has a criminal record.