I totally get that. I just meant that the presence of the PATENTS file is sufficient to cause doubt in the minds of decision makers at certain types of bigcorp

I totally get that. I just meant that the presence of the PATENTS file is sufficient to cause doubt in the minds of decision makers at certain types of bigcorps. These projects are never going to release their code under any license. They're more concerned about what the patent grant means if they use React at all. It might not seem entirely rational, but in some circumstances, in risk-averse companies, it's enough to sway the decision away from React. I don't work at such a company, nor would I choose to! :)