In reply to stephen.

Show me the Ts &Cs where it says Facebook can terminate your license to a FB login or like button, if you bring a patent infringement action against FB. I have never seen that.

However, for React, if you or your 'affiliates' brings an action then the license is automatically terminated. So down the road if FB were to infringe on WP intellectual property and WP filed an action -- then it's very likely that anyone on the WP platform will have their React license revoked. The converse might be true but it's not clear: if someone using WP as a dev platform brings an action against FB, will that be enough to revoke WP core use of React.

https://github.com/facebook/react/blob/master/PATENTS

This is a big deal and should not be brushed aside; if anything it needs a competent IP attorney (or two) to render an opinion. I hope whoever the team is that is deciding on a framework is having this integrated legal discussion.