Comment by tyingq

Well, in this case, a porn site wants to tie what it shows you to what you liked last time you visited. They aren't after your identity per se. They are after a conversion. And since you might be using incognito mode (no lingering cookies), they care about fingerprinting for that.

Edit: I see the disconnect now. I'm not saying Google/chrome added the midi API for fingerprinting. I'm saying the screenshot way up this thread is an example of a site using it for that purpose.