It already does, though not in the individualized manner he's describing.
I don't think that's entirely a bad thing. Its current form, where priority one is keeping advertisers happy is a bad thing, but I'm going to guess everyone reading this has a machine learning algorithm of some sort keeping most of the spam out of their email.
BlueSky's labelers are a step toward the individualized approach. I like them; one of the first things I did there is filter out what one labeler flags as AI-generated images.