@ThreeBadgersInATrenchcoat Hey! Thanks for your response. Self-hosting Nextcloud I'm not sure of... I don't know if I can set it up properly on my own just yet.

Why do you think protonmail is shady?
As for custom domains, I mean, every ~10 or so years there will be better providers out there so I don't want to lock myself in so early. I have tutanota email but like, I'm worried if they go under or slow down development.