Andrew Pruski goes messing around:
When I first started working with SQL on Linux one of the first things I did was to remove the default the [BUILTIN\Administrators] login. This is pretty much standard practice with SQL on Windows as we don’t want administrators on the server to have automatic sysadmin rights into the SQL instance.
But this login makes no sense on Linux as there is no administrators group, so it should be dropped…right?
Andrew then goes on to show us why that’s not right. Read the whole thing.