Is it true this server uses Bitcoin miner?

No, its is not true.
If you open properties of our launcher, in windows you will find, that its not some "noname" programm like others use. Its officialy signed by Microsoft certificate programm, which registered on real company "Gamez Network" and also have security certificate from Comodo. Microsoft never give signatures to "hidden miners" etc. So somebody just try give you fake information to ask you play on other server with 50 online where players will be scammed. All 17 servers what was opened last years used our stolen old files or retail stolen old files and always they start this desinfromation action which end by close their servers and scam all people. That was history why you saw those "claims" about miner

Also want inform you that we not only not have miner, we also uses best antihack programm contract "Smart Guard" which is exclusively ported from L2 to GamezBD and thats why Gamez now can offer you more fair gameplay even then retail BDO.