Sorry, if you read the page linked you'd see that that is not the case. It is open to SELECT, UPDATE, and INSERT. if it were SELECT only that would be read-only.

As it is, that's just stupid as any user can wantonly edit anything. I could trivially edit every level's author to be myself or do intensive operations which result in a DOS.

The only smart way to give clients access to a database is through some sort of frontend entirely under your control which prevents them from having the user/pass and sanitizes the queries.

Edit: Whoops, while I typed this multiple other people did the same. Sorry for the redundancy.