A blacklist of customers for Ukrainian online stores?

Keeping a black­list of cus­tomers is a humil­i­at­ing and deeply unpleas­ant business. I’d like to hear what col­leagues think: is it worth build­ing a shared list of dis­hon­est cus­tomers for online stores?

In all my years in busi­ness I haven’t had that many char­ac­ters like that. But a recent big lin­gerie order, where some of the items came back soiled and the cus­tomer’s phone number googles to a model’s ad on http://napodiume.ru (so clearly they did a photo shoot in the lin­gerie and sent it back), is push­ing me to think about the idea again.

As I recall, one Ukrainian online store once sent around by email the details of a cus­tomer in a sim­i­lar case.

Questions:

1. Do it or not?
2. Open access or restricted access (only for part­ner stores)?
3. How legal is it to show cus­tomers’ data in public, even cus­tomers who aren’t very decent?
4. Criteria for how “harm­ful” a cus­tomer is: some­one who simply placed an order, the courier came and the phone was switched off, is one case; some­one who sent back soiled lin­gerie (yes, our courier didn’t check, which is also a prob­lem) is another.
5. A cus­tomer who just wastes your time is no reason, in my view.