Earlier quoted context omitted.
sometimes I try to mess with sites that ask for an email address for a mailing list by entering their own addresses: like "support@domain.com", "webmaster@domain.com", etc. let them deal with their own spam, then they'll understand.
My go to has been "ceo@example.com" for years. Or various Five Eyes addresses.
I think I may make the effort to learn how to make a Firefox extension to automate this. Scrape "about us", "contact", etc. page in background for first email address, then autofill it into the email spam form. Boom, done.