That's quite a comparison for someone working at Facebook naming a small open source project the same generic name and then publishing it to Github Marketplace for free without mentioning Facebook at all, but I'll play along:

Yes, they would be implicated to a degree, but it would be a stretch to say that Facebook robbed something, rather than saying that a few Facebook engineers robbed something. Also, in what sense did Facebook "[get] all the goodies from the robbery"? The action on Marketplace doesn't mention Facebook at all, so other than using the action (which doesn't require anyone to publish it to Marketplace), which goodies exactly did Facebook get?