SEO has essentially destroyed search engines, what are some very useful websites that you might not get given by Google?
Google doesn’t even factor into this. Go to your registrar of choice (namecheap, etc), buy a domain, and setup that domain to forward all emails to your email address.
So if you have abraxas@gmail.com and you just bought abraxas.me, in namecheap you can setup *@abraxas.me to go to your gmail account, and then sign up for sites using whatever@abraxas.me you want. There’s no + or - involved, use any word you want. Signing up for lemmy.world? lemmyworld@abraxas.me will go right to your gmail (or whatever email you use)
Are you able to differentiate between emails as they come in? E.g., seeing an email was sent to lemmyworld@abraxas.me vs spammynewsletter@abracas.me?