Could be a coincidence IMO otherwise that would mean that there was a breach at lemmy.world where you signed up. Tagging @ruud@lemmy.world.
I signed up with an email address dedicated only to this account 8 days ago and so far it has received nothing except the 2 verification emails (the one where you're prompted to click a verification link, and the subsequent email confirming your verification), my spam folder is completely empty.