So I got yet another automated email from someone who signed up for a thing with one of my email addresses, thinking it's their email address. Props to Snapchat for being the first and only company I've seen that provides a one-click way to fix this situation.
(But minus a few points for using a “here” link, of course.)
@siracusa Reddit does this, too, thankfully, so there aren’t 65 burner accounts under my catch-all domain.
I decided to keep the Instagram account that used my Gmail address: https://www.instagram.com/laa.monsta/.