I don't think it's consistent to say that german toolserver developers can run queries that admins can't, when some of us aren't admins, and most of us aren't checkusers.
The question is what data is *published*. But yes, perhaps there should be more community control over who gets access to the toolserver. While there's no highly sensitive data visible, the possibilities of mining the database could still be abused.
Do toolserver developers need to start being careful about the private queries they run?
You always have that responsibility if you are going to publish the results.
Even though most of the data is available from download.wikimedia.org?
if the raw data is public is not really relevant, afaik legally and imho morally.
-- Daniel