In reply to Kevin.

Using React gives FB the ability to revoke your license if you file a legal complaint against them for IP infringement.

So, you create something cool and you patent or trademark it. FB decides they want it, so they steal it. You file a legal proceeding against them. They revoke your license. You may be right but you'll starve while watching your bank account vanish in attorney/court costs, while they get an injunction against you so you have to yank React out of your project.

Not a big risk for the sole developer making plugins for the knitting club. But infect WP core with this and the stakes will be much higher.