When I sell my email list I strip everything after the + and all dots too. So, crisis of reselling personal data eliminated.

-- I don't do this, nor even in the industry to do this. just saying ... those that are, they know all these tricks and just regex around it.

PS -- there are a tonne of email systems now that offer relays. Just use one of those. duckduckgo-mail or firefox-relay or mailinator or ... and on and on.