The problem with the patent clause was that it prevented you from suing Facebook for any patent infringement, even if it's unrelated to React. If you're a React

The problem with the patent clause was that it prevented you from suing Facebook for any patent infringement, even if it's unrelated to React. If you're a React using-company, this more or less meant that Facebook had carte blanche to infringe on any your patents at will in an exchange for a license to use their React patents. That's a quite one-sided deal.