I mean, the cool things are cool (even if I have a really hard time with Facebook as a company) but I think it's a bit of a stretch to say Facebook has "the recipe".
Whereas PyTorch is intended, from the ground up, to be a widely useful project, and the dev team weights open-source issues at least as much as internal ones.
(Full disclosure: I used to work at Facebook, including, briefly, on PyTorch)
But my subjective point of view is: Google project = “Meh, this big opinionated framework will be probably be abandoned in 2years and all those poor folks who adopted it will have to rewrite everything”, while Facebook project = “Wow they just took the best of the state of the art, and packaged it in a simple reusable library that will be supported decently”.
Not a big fan of Facebook as a company, but as an open source contributor they are among the best in my book.