Wouldn't this basically start by destroying many American companies? Nest would have nothing but it's IP seeing as Google owns the platform, same for IG. On the other hand, what is stopping IG/ Nest from licensing the old parent's services? seeing as I imagine all of these post-breakup companies would still have the same investors, what's the difference?

Basically, how would you stop Google from shadow-running Google Ads? What would stop them from preferring Google Ads?