the checklist version of the Obsidian manifesto:

1. free for personal use
2. interoperable local plain text files
3. no telemetry
4. E2E encryption
5. flexible API for desktop and mobile
6. actively maintained/patched
7. no VC funding

making /obsidian • writing stephango.com

yes, Obsidian has had E2EE ever since Sync launched

Front-end dev in solidity world 
Previously http://aave.com and https://bgdlabs.com 

Side project encrypted photo and video folder
https://apple.co/3PGN4iD

I'm thinking a lot if it's possible to create a collaboration engine with e2e without a server purely on file cloud drive file system. if the content is e2e encrypted do you manage conflicts locally?

yes, Obsidian has had E2EE ever since Sync launched

https://help.obsidian.md/Obsidian+Sync/Security+and+privacy