Honestly, not very many. I've signed up for 300+ companies, maybe more, everyone with a different email. Many of them signed me up to their mailing lists that I

Honestly, not very many. I've signed up for 300+ companies, maybe more, everyone with a different email. Many of them signed me up to their mailing lists that I didn't ask for and didn't want but they usually made it one click to unsubscribe. One that sticks out is Kohl. I never signed up for them and they spammed the shit out of me 15 years ago. I've never shopped there and from the spam I never will. Otherwise, a conference running company in Japan spams me and they use a new email address on their end for every new conference.