Anytype :)
https://doc.anytype.io/anytype-docs/intro/readme
https://github.com/anyproto/anytype-ts
Has a desktop and mobile app. You create an ID which is loads of words stringed together. You can use that ID to decrypt and access your data. If you lose that secret your data is gone.
On that note… Also take a look at DeArrow
https://dearrow.ajay.app/
Same dev as SponsorBlock, same concept, just for YT Titles and thumbnails.
Users can submit titles that better describe the contents and pick a neutral thumbnail.