This isn't an "infraction" you can police with a fine, jail, etc. It's an industrial structure. The competition is competition for monopoly, a superior & highly profitable market position of some sort. Those are what make Google, FB & so profitable.
Google competed with Yahoo & Microsoft for years in search marketing. I don't believe either ever made significant profits. Their "market share" in terms of users may have been 10%-20%. But, their share of market revenues was a fraction of that. Their share of profits was negative.
OTOH Google pays (for example) Apple $7bn per year to make Google Search default. That's better than best case scenario profits MSFT or Yahoo could have hoped to make, unless they managed to replace Google in the no. 1 position.
Competing is just a lot less profitable than cooperating in a lot of cases. What is Apple supposed to do, say "keep it, we're good?"