[tmslnz]

Like many others in this thread, I have been using alias-to-subdomain remapping with Fastmail since time immemorial. Having this trick automated to some degree can be convenient for less geeky or fastidious users than I :)

Other than thinning my online identity to make any assumed attempts at correlation harder, in a couple of cases over the years I had the pleasure to "Gotcha!" companies selling (or losing) their users' email addresses. In other cases I also received unrelated spam on addresses as a result of undisclosed or less-publicised security breaches.