Why you put your private keys into an online website? the btg-developers cant control every 3rdParty-Platform. even if its opensource, nobody knows what they finaly host 
the only save wallet for now is to sync your own BTG-Node and import your private keys there.
the only save wallet for now is to sync your own BTG-Node and import your private keys there.
because it was advertised on official BTG website and their twitter as a safe web wallet. in fact i didn't google that link, i got on a mybtgwallet by clicking on a link on official BTG website. I'm not the only victim, there have been lots of wallets plundered by this scam.