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I think web browsers should implement already an API that allows developers to track any user in a "private" way, by generating a unique hash using your computer specs or something, and make it different for each website.

So, if you visit Google, your hash would be something like "h38kflak". If you're visiting twitter, the API would generate something different, so you won't be tracked across websites.

That way, even if you clean your cookies, you can still be identified as the same user.

The use case? Fraud detection and that kinda stuff. For example, you may create a web game where you allow users to play instantly without "creating" an account. So, an anonymous account would be created in the background, in order to log in. Any bad actor can just clear their cookies/storage to bypass a ban. IP banning isn't reliable, as multiple users may share an adress.

It's a shame that we have to rely on web api hacks in order to fingerprint users for legitimate reasons, and that ends up in an eternal cat and mouse game, because anything you try today may be broken tomorrow.

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Because users do not want to be tracked or fingerprinted. I don't care about fraud detection and I am not a fraudster so why do I have to be tracked? There is no way that a feature like that would not get abused in one way or the other.