That disposable-email-domain project is a good one. Over 10 years ago I did a dumb thing and pointed some of my domains MX's to Mailinator before I used them for real email with Fastmail and now the domains are flagged all over the place as disposable even though they haven't been used that way in ages.

This project has an allowlist you can submit a PR to so it doesn't get sucked back in every time people submit outdated lists of free email provider domains.

I've sent dozens of PR's to de-list my domains on various projects across Github and it's like fighting the sea, but the groups making opensource software to use these lists are at least very apologetic and merge the PR's quickly.

However, the biggest ASSHOLES are Riot Games. I've reached out to and they will not ban new user registrations on my domains. I eventually just had to block all the new account registration emails for League of Legends I was getting in my catch-all. The maintainer of the tool people were using to make new accounts was very responsive and apologetic (quickly merged my PR) but it doesn't stop people who used the old versions of it from continuing.