What's wrong with Flow, Jest or Graphql? I think these are all fantastic projects. I mean, Flow "lost out" to Typescript, but, it's usual for one winner to emerge from competing frameworks.
Graphql is great. With Jest, that project feels a little abandoned because the Typescript support (ts-jest) is pretty janky and has bad performance. Meanwhile in the ecosystem in 2022, it's becoming the norm to have first-class Typescript support.
IMO that should be celebrated, not shitting on fb for their poor track record of going out of their way to open their source code to the public.
I hate meta as much as the next, but come on.