Many hostels in Warsaw. (I could start a list of them!) I have heard the list discussed many times. These hostels cooperate to some extent to find beds for people when they're overbooked, and apparently sharing a list of problem guests arose out of that and communist era traditions. To some extent, I understand their concerns. Do you really want to share a room with someone who got so drunk that he just peed on the floor? People having sex in the common areas is another area that is likely illegal and quite rude. Those who are more discreet and disappear together into a toilet or shower should have a presumption of privacy, even at a hostel. However, they still need to pay when they break the sink off the wall.
The 'black list' is still being used by someone? Who is using it?
I don't think that it would be a problem to prove that they are keeping a blacklist. I have enough emails and can name names if needed. They have plainly admitted to it.
Expensive and ultimately probably fruitless, unless you've got a copy of said blacklist.
Thank you for posting the link. During my time here before, I saw enough of the communist era mentality still openly manifested. As the market expands, those doing stupid things get punished my the competition. I suspect that unless there is some exception for hostel owners, that there was some commie style bribery involved. I highly doubt that any of this has been registered. I will start writing emails to some of the hostels involved and possibly also booking services to alert them to the declared practice of blacklisting. (I have never had a problem with booking, but I also don't book shared rooms anymore.)
If they don't comply, I should forward this to the police or directly to the prosecutor's office?
A company can be prosecuted if they don't comply with Data Protection law,