> Why would every website's business model be based on ads and tracking?
Certainly there are for-pay services as well, but the absolute vast majority of people prefer to pay with their privacy than with their cash, to the point where starting a for-pay service of that type today without a known brand name behind it is not going to pay your hosting bills let alone put food on your table.
Why should Google know that I'm looking at the translation of sexual words in Japanese? Actually, even Google does not want it.