Any time there is the potential for financial gain, there will be people trying to hack the system. The Bitcoin/crypto currency world itself is a perfect example as almost every day brings another exchange that has been hacked and robbed.
Kudos to you for having the skills, patience and the ethics to try and clean house here.
Hopefully, as time goes on, we will all become more knowledgeable in the signs of these fake accounts, and make your job easier.