Depends if they get breached haveibeenpwned.com style. I definitely and clearly get spam from several breaches. Some is generic (it’s on some big spam list) and some of it is targeted - like crowd funding campaigns spamming the hacked list of kickstarter accounts - which I am surprised how much of I get given how community driven such things often but I guess are not always.

Some of these addresses were the unique style you mentioned.

So I guess you’re just lucky.