"But there might be some lonely people who like to be tracked then receive
advertisements that are tailored to their preference."
They "fingerprinting" the users to detect them across different platforms and
computers, then sell that information to data brokers. Once they know what
you really want, they will show you special increased prices, because they
know that you really need to by that item.
If they know that you want to by a fridge, your price will be: 20% off, paid
delivery.
For everyone else that same fridge will be: 40% off, free delivery.
You see how tracking will cost you additional money?