Earlier quoted context omitted.
Even if you split the search and ads divisions into two companies, what prevents them from entering into a partnership and keep doing whatever they do now?
That's what I fail to understand in these breakup threads. They would be free to business with whoever they want. It feels like if a breakup happens it's mostly paperwork and accounting changes in practice.
If/when business was unavoidable between two offspring companies, at minimum, I would expect them to have to inform the FTC, justify how it was unavoidable, and make the details of the transaction public. If someone complained that it wasn't unavoidable, quite possibly there would be additional penalties leveled on each of the participants.
It's not like some Monty Python character waves a wand and declares "you're not n different companies", only to wander off and never exercise oversight. Mind you, I don't think there's enough political capital in the world to manage to break Google up, but if it did happen then the judgement will have the teeth to make sure they're actually broken.