If companies would respect the spirit behind GDPR and not store data that is not needed to fulfill a user's requests and protect the data that they must have in a way that makes dragnet searches impossible, this would not be a problem.
Instead, we have sites not being ashamed in informing you about literally thousands of external ad broker, tracking, notifications and whatnotelse integrations.
To u/decremental: you seem to be shadowbanned, here's an Archive link: https://archive.ph/kAXQ1
Saving user watch history is useful for users. Sure, make it optional, but I find it really useful that youtube shows me if I've already watched a video, and that I can find recently seen videos in my watch history.
Why isn't "I want _you_ to know but I don't want you to use it against me." an option?
Being able to sell histories means being able to sell supposedly more effective ADS. Also shows ads were viewed and by whom.
Precision of any kind in demographics is worth a lot of money.