Comment by Sayrus

Safari already implements API that leaks enough information to uniquely fingerprint a device.

For instance, the Audio API. You can test it using OpenWPM [1][2] and you will get the same ID in both normal and incognito mode. And this is only one of many things not blocked by default. ETAG tracking is pretty popular on pixels.

I'm not saying they aren't right, I'm just saying that they are somehow doing more PR than anything else. And as other comments are calling out, this makes it even harder to compete on IOS using PWA (How is a website asking for permission different from an app? Can't we have a permission framework just like apps?).

[1] https://audiofingerprint.openwpm.com/

[2] https://github.com/mozilla/OpenWPM