A 5k fine is still significant, especially if they can apply it for each act of non-compliance. So if they ask you to disclose information that you don't want s

A 5k fine is still significant, especially if they can apply it for each act of non-compliance. So if they ask you to disclose information that you don't want several times in a single day (and slightly changing what exact information they want to access), you could be hit several times with a 5k fine. At that stage it should be affordable enough to hire a lawyer to deal with it.