How is this that neither the document, nor the comments here address the issue with permission aka one user potentially corrupt other users data
There's probably an extension for permissions in sqlite but out of the box the db files are plaintext (you need an extension for that).
Good starting point for extensions: https://antonz.org/sqlean/
SQLite only supports a single writer at a time, but does support concurrent reads. There is also an experimental branch that supports concurrent writes.