Facebook may have it's moral and ethical failings but that's a stupid reason to blindly attack everything they do; especially when, in instances like this, it is objectively a positive influence. They're promoting open source tools and open access research.
I think this OP's expletive is more appropriate to some applications of FB's AI research and tools in their products.
If they weren't investing heavily in AI research & tools, they probably would've leveraged Google's TF, Microsoft's (since they like them) CNTK, etc.
So, in net, they have a positive impact with PyTorch which is the subject matter. Not facebook.com.
However, in my very personal opinion there is no way any amount of technical prowess can be considered compensation enough for the mental health issues brought about on young people by all social media platforms, especially Facebook.
Add to that the malicious use of data, add to that the failure on Facebook to keep data secure, and I struggle to see why we would back their cause...technical or otherwise.