If you're privacy-minded, it's worth keeping an eye on these efforts, as some of them involve getting publishers to require a login and an email address or phone number from their users, then using that as the persistent identifier.
If that idea takes root, then we'll probably want to cancel accounts and avoid making new ones.
instagram is insta@mydomain.com, netflix is nflx@mydomain.com etc.
If someone needs pointers: I use webfaction for MX, setup mailboxes with catch-all policy and setup a rule to forward these email to my gmail and have a filter on gmail to skip inbox and save in "dummy" category.
p.s. if someone has a better alternative to webfaction for email only stuff, please let me know, not sure if I can do it with an other provider that is cheaper.
Best online hygiene decision I have ever made. Ranks up there with installing ubock origin on desktop/mobile.
(n.b., I've done something like this for ~nearly 20~ 23 years, and I've scaled back to prefix+tag with some aggressive blocking of email addresses that have been leaked/sold)