Besides the point, but how great is the growing prominence of alias generators? Proton has it built in, icloud has it built in. Haven't used google product in a long time but surely even they have an equivalent by now.
For new internet people, they should get an email that is like a random 4 character email address, suffix'd with a + subalias address. Like so: 45ty+nashashmi@aol.com. And change the suffix at will for different people, all while junk classifying anything that is not a recognized address.
The only thing is email vendors need to follow through on this and allow for emails to be sent from that address.