So, I met another 2 scammers on localbitcoins.com (total is 3, and 1 candidate). The scammer starts Tor client, buys bitcoins on localbitcoins.com, pays by SEPA from Deutche Postbank (yes, all 3, albeit different names, cities, IBAN; unfortunately I cannot verify the fourth), receives BTC and then tries SEPA chargeback. This happened for all my 3 bank accounts. I even waited 1 day, releasing BTC 1 day after receiving euros, and still this happened. Another interesting thing is that all those 3 scam payments took unusually long - 4 or 5 business days. The payments probably seemed suspicious for banks also.

Any idea what is going on? Some security problem at Deutche Postbank, and scammers got unauthorized access to random bank accounts? Or is Postbank attacking localbitcoins this way? But they wouldn't need Tor I guess.

Anyway, thank you, kangasbros, for this feauture that warns when other user is using Tor. Now I only have to start using this information.