It certainly does not get around the ...if your account gets banned maybe the forwards will still work... concept but in general something like https://github.com/joeyates/imap-backup to backup your email and then add them to a typical backup process with your other files works well.
Something like this could have a nice future as an open source chat framework for building custom UIs if it's well made and modular, but that isn't gonna work well with a SaaS model.
"What's Max's GitHub username?" "I need wire transfer instructions for an incoming wire"
We also index competitors' helpdesks and KB articles to track new features they're rolling out. Our tech support team uses it daily because Freshdesk's AI is terrible and their internal KB search is lackluster. Onyx actually finds things. The value isn't in being "one chat to rule them all" — it's in unified search across disparate systems with citations. That's not getting commoditized anytime soon. Keep up the good work, team.