They just answered the question I asked them by email on February 1st, and their answer was that they are still not sure and are trying to figure it out. Which is funny, because on February 2d I called them on the phone, and they were in fact sure. I told them to contact me if they change their mind once again.
I have a feeling that soon Viestintävirasto will put me on a difficult customers list, with the following comment: "Source of endless questions. Do not encourage or contact, ever."