Yes I run one.

As I said, users must make the difference between private and public use.

Public use - all the communication with public identities and all your public "face" on internet. This could be tuta or proton.

Private - your fucking private life that is non of others business (family, RL friends, direct business partners etc)

Example: I have a private domain, self hosted, used only for my whole family and some friends. Each one have their own account on my domain, controlled by me only.

Another private domain used only for direct messaging with business partners. With some of them even having an email account on that server. Private communication.

public is public, private is private

Nobody: "Darth, do you have a guide?"
Me: ofc I have a guide...
https://darthcoin.substack.com/p/avoid-being-spammed