One of the greatest parts about owning my own domain is using different email addresses for these random websites that want to blast me with newsletters. That way, I can just redirect spambotscrapinghn@snazz.xyz to the trash if they sold my email address or I start getting spam to that address.

You can do the same thing in Gmail with the +, but some websites filter those out or don't allow them.

I was expecting you to say "I immediately mark it as spam". Do it, treat unsolicited newsletters like the spam they are. If enough people do this, it creates significant problems for the authors of such email.