yesbut parent
I'd never sync my shell history with a third party. The self-hosting option looks interesting, but anyone comfortable with syncing their shell history with a third party is severely lacking basic privacy literacy and underestimates the sensitivity of command history.
All user data is e2e encrypted, but yes self-hosting might make you feel better about where your data lives
We wrote some more about it here: https://blog.atuin.sh/new-encryption/