Earlier quoted context omitted.
I agree that Google & FB violated the terms of the agreement they had with Apple. I think an interesting question is: What is Apple's best move from here? I would suggest that Apple should leave Google/ FB blocked for ~1-2 weeks, to remind them who's boss on the iOS platform. However, I would argue it'd be smart for them to switch them back on after that- there's a chance that this looks anticompetitive to regulators…
There's absolutely nothing anti-competitive about this from a legal standpoint whatsoever.
There's no actual legal requirement that your company offers the same service that you use your market control to prevent your competitors from offering.
This is especially relevant in the markets where Apple has a significant market share (USA).