Email aliases. Firefox Relay is a good one. The free version is limited, but I found the Premium version absolutely worth it. I don't have to give my email address to anyone other than Mozilla (which I understand appears a bit redundant in this case) and they use it only for that specific purpose. And in this case, their "generic" privacy policy is a relatively decent one. I'd still use an email alias for this tbh (even though they already have my email), just for consistency sake. I basically use the aliases to organize my email at this point. Different aliases for different purposes. And the email address they have is a private one on my own domain that is setup on a different email server, so technically it's still once removed from my actual email.