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)