I think both the approaches in your comment and the one above (Or any comment to that matter) are worthy of a lengthy discussion.
But my point was more directed towrds understanding how companies this big are starting to behave.
I do think antitrust is a way to look at it, but the anti trust laws in the US I think are difficult to point towards Google for instance (Probably the same about European laws)
> we aught to have a discussion about whether nation-state size companies are really a desirable feature
I think it goes a way longer than that. Obviously private companies are subjected to a lot less scrutiny than states, but states do miss behave and do not run into the risk of eternal intervention, unless they really fuck up, and even then.