If you’re in the US, register here: https://registerme.org/
They require you give them an email and then once you do they spam it relentlessly.
Maybe they’ve changed because I donate and also contribute as an editor, and checking my email, I’ve only received one email* from them all year, and that was on January 6th titled “A record of your support for Wikipedia” from the Wikimedia Foundation, and it was a thanks and a tax receipt.
Maybe there’s a consent checkbox somewhere that I don’t remember unchecking.
*not counting notifications received in my role as contributor.