I don't know a single person who would legitimately infer the affiliation of a person based on the username part of an email address. I've been using a catch a

I don't know a single person who would legitimately infer the affiliation of a person based on the username part of an email address. I've been using a catch all since forever, foremost to detect when shady companies illegally sell my data -- i.e. I register with shady-store@ci.ax and when I suddenly get unrelated spam to that email I immediately know who's responsible. (Or who got hacked without acknowledging it.)