Will be compulsory to use for jobseekers from next year (as in, 2 weeks from now).
Have a friend who uses it. They checked the terms and conditions of signing up to use it (remember this is mandatory for those people who wish to sign on for benefits, e.g. somebody who has paid taxes for 20 years and would now like a little back from the taxes to help them get by on important bills for the next few months til they find their next job). If you register on the system, the terms and conditions currently note that your personal data can be passed on to third parties outside the EU.
I don't remember us signing up to that agreement when we agreed to the contract where we pay taxes into society, and when we need some help we can get a little back.
I'll ask my friend to send over the details of the text and I'll post it.