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FB actively uses it, so it's a win win isn't it?

That is a complicated question. They get marketing and a few more eyes delivering bug fixes. However they also get to deal with contributions going not exactly in the direction they want and either have to argue against or take maintenance burden on themselves. Also they limit the changes they can do. An internal framework they can change as they like. They know all users.

For different projects that works differently well.

But this way they get an “internal” framework that they get to exert a lot of influence over, with the added benefit of most of the labor market for those roles already being familiar with it. Building in house tooling adds a lot of cost to onboarding, but this way gets most of those benefits without having to accept that cost.

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