Oh dude I love doing this!! I shopped insurance recently and used a BS SimpleLogin address. When I was done shopping, I signed up for a company with a different actual alias and turned off the SL one. Now all emails from those other companies are rejected, and my info won't be sold of and shared because they'll get bouncebacks!! Now I won't get harassed with email. It's also easier to tell who sells my info.
I'll do the same thing next time I car shop. I have a 2nd phone number to do this with too, bc I can send everything to VM and just leave it full until I need it.