I was getting these emails from having an Epic account for Unreal Engine. Since I don't use Unreal anymore, I had them 'delete' my account.
I've only gotten a couple emails since doing that, which is very strange to me. If a regular attempt still triggers that email, wouldn't I still be getting just as many emails? It makes me wonder if the people doing this are triggering the attempts in a special way, or if there is some way to view all accounts, so now my account isn't being listed and therefore isn't having access attempts anymore except by people who already built up a database of accounts.