This attitude is so self-defeating. If no one hosts their own email anymore, no one will be able to host their own email anymore in the future. Having said that, I host some of my mail with Hetzner, and even at their scale they sometimes have deliverability issues.
Yes, the world will be a better place with a real email alternative. The current system does not work. I should be able to refuse emails and not get spammed with life ending phishing and malicious links around every corner. Email providers shouldn’t be able to whoopsie and delete emails on my behalf, or gatekeep information that’s needed in court. Self hosting doesn’t fix the core problems with email even if you don’…
Basically you had to play a (very small) amount to charity to cold-email someone (and with an escape hatch if you state you know the person)
That system would basically gate all spam without changing much