Heather Meeker is a lawyer who represents Facebook. I have a background in this (although I am not your lawyer, so please do not take anything in this post as legal advice). The license is a serious issue for a subset of software companies and private developers.
Interestingly, most of the posters correctly identify the core concern. If you've invested significant resources into developing React projects, have IP, and Facebook infringes your IP, you're in very hot water.
Most businesses aren't competing with Facebook or patenting business critical innovations in spheres Facebook will be operating in. Using React in all of those cases is a non-issue.
For these people, the license's restrictions seem very minimal, so dumping React in the Open Source bucket seems reasonable.
For others, this restriction is an existential threat. This is why other people have an issue with the license being considered open source.
Interestingly, most of the posters correctly identify the core concern. If you've invested significant resources into developing React projects, have IP, and Facebook infringes your IP, you're in very hot water.
Most businesses aren't competing with Facebook or patenting business critical innovations in spheres Facebook will be operating in. Using React in all of those cases is a non-issue.
For these people, the license's restrictions seem very minimal, so dumping React in the Open Source bucket seems reasonable.
For others, this restriction is an existential threat. This is why other people have an issue with the license being considered open source.