Why is moneorv windows wallet gui.exe being quarantined as Trojan.BitCoinMiner by malwarebytes ?
Because you can mine MoneroV with it and that is considered a malware by antivirus software. Monero has the same problem (MoneroV wallet is a clone of the Monero wallet).
Other mining software have the same issue. For example XMRig shows up also as a malware.