Multiuser in what fashion?

If you absolutely need high concurrency, then by their own admission pick something else. [1]

But for most things you can survive queuing up writes.

1. https://www.sqlite.org/whentouse.html

I assume you’re asking about concurrent writes and yes, if you use WAL mode you can have that too.

https://www.sqlite.org/wal.html

SQLite does have an optional "user authentication" extension, though I've not personally tried it out:

https://www.sqlite.org/src/doc/trunk/ext/userauth/user-auth....

The widely used Go SQLite library by mattn says it supports it, if that's useful:

https://github.com/mattn/go-sqlite3#user-authentication