Or if you now have to pay for X what you used to get for free
Google already does this, bolstered by their monopoly. You used to be able to listen to Youtube videos with the screen off without paying them.
YouTube vanced ftw
That's an assumption. Severing the financial tie might not necessarily fully sever the operational relationship. Obviously Google would be pushing that narrative hard, but it would be relatively easy to push back and say, "Separate companies with a non-exclusive relationship would still be lucrative and so the two companies that result from this action aren't going to give that up just to spite consumers/regulators."