Signing over rights is one thing. Discriminating against people without a permanent address, or a phone, or any other person who can afford a laptop and not much else, and has high value contributions to make if only they would be accepted, is being an ass to humanity and you should feel bad and change that.

They even require you to sign their CLA just for README.md updates - that's not "being safe", that's "being willingly idiotic".

Facebook legal is not interested in changing the CLA requirements to something that doesn't discriminate, and despite the rather large number of people who work on their open source projects, who would all love for that CLA to fuck off so they can do open source properly, Facebook as an organisation is still not a good citizen in the open source space. They're still trying to put up a walled garden as much as they legally can, even if you think you can't see the wall anymore.