Ok, but what about as a CDN/website-proxy/WAF? I know we don't have the same automated reputation-propagation as with email, but same thing supposedly happens there, where eventually you get turned off if you don't act on lawful requests, which is exactly why Cloudflare is unavailable in Spain during La Liga matches, because Cloudflare don't take piracy streams down.

In theory, Cloudflare should take those down, when requested by legal means, but that doesn't matter. How sure are we that they'll act differently for email, instead of trying to get rid of the reputation system instead?

> getting that email to not be rejected totally IS rocket science and it's simultaneously an art form known only to a handful of email nerds working at the core of the big email sending services

It really isn't, you need a clean IP and a clean domain, send handful of emails and you're pretty much whitelisted on most services out there. Maybe you'd say I'm one of the handful, but I personally know more than a handful others who also run their own email services, just like me, and besides the usual hassle of running your own service, as long as you don't spam, your emails will arrive as usual.