Earlier quoted context omitted.
Anything that smells anticompetitive is kind of a dangerous dance- by preventing two of their largest competitors from developing on their platform I think they'd be inviting some regulatory scrutiny (even though FB/ Goog DID violate the agreement).
Isn't it anti-competetive in general then that big players get more protection from consequences via this logic?
The reality, though, is that this sort of behavior in VERY large, VERY influential companies is going to draw way more scrutiny than a small company getting crushed by one of the big guys.