While I agree that large firms often collude, we do have laws against that in the U.S. In fact, I believe FAANG has gotten into trouble before for collusion on

While I agree that large firms often collude, we do have laws against that in the U.S. In fact, I believe FAANG has gotten into trouble before for collusion on hiring practices. But those are different laws than the ones against monopolies. I would not be totally surprised to hear that, for example, Google and Facebook collude on advertising, but I'm not at this point totally convinced of it either.