For Google users example, free-tier will allow each user account 5 searches per month that will not be tracked and recorded, so essentially users will have an option to specify right before the moment of each search to indicate whether this specific search is going to be “cognito” or “invisible” (perhaps by just ticking a checkbox).
Higher tiers offering greater amounts of private searches per month will simply cost more to purchase shall those consumers desire. Ran out of private searches? Top it up just like prepaid phone credit! This way those users who are extremely privacy conscious will have a solution to protect their own privacy while Google has invented a new revenue stream and can even increase profits from their valuable services.
The next generation Capitalism 2.0 will now enjoy privacy becoming a new cash cow industry overnight. The question then will be how much are people willing to pay for an unlimited account?