Revenue isn't a good comparison and is more of a distraction than a usable data point. Presumably, if Google is servicing paying customers instead of paying ad

Revenue isn't a good comparison and is more of a distraction than a usable data point. Presumably, if Google is servicing paying customers instead of paying advertisers, then google has much less work to do. Their revenue can decrease without their profit decreasing. They don't need to manage engineering to store cookies and track interests. They don't need infrastructure to store profiles. They don't need cpu cycles to correlate interests. They don't need lawyers to fight off regulators. You can easily imagine other things they would not need for those customers. How much would paying customers need to pay so that google would make the same amount of money? Revenue isn't even an upper bound on that question.