Damn I hope I never have to leave gmail and bother with this self setup crap. Would you self hosting guys feel silly if gmail existed in 30 years and you wasted all this time doomsday prepping for nothing?
But ya for me the piece of mind is worth it. The serious risk, as you allude, is probably not gmail disappearing, it's gmail getting worse in any number of ways.
Isn’t that also true with GSuite?
But I'd be pretty fucked if google decided to ban me back when my gmail address was the email address I used for everything.
As for self host, you know that person said they pay for email right? We log in to fastmail the same way you log in to gmail. It's no hassle just a low cost instead of free. Iirc getting it to use my personal domain was a copy and paste job that took like 15 seconds.