Hi, I am also one of those scammed by this mybtgwallet site. The way I see it is also that the BTG team is at fault here, in multiple ways. Firstly they didn't have a disclaimer that those are community sites and only added it after this incident. They assured everyone on Twitter that the site was safe and they personally vetted the team. Secondly from all appearances it looked like an official site they were running so depended very much on the trust placed in them.
They also had numerous incidents of negligence along the way. They should have had proper replay protection BEFORE the fork. They could have done a private fork and tested this before announcing the official real fork. Instead they ran a competition for a member of the community to come up with a solution. They decided to implement a "unique address format" which itself is good but they should have had an official tool to convert addresses before even announcing the fork. I asked them for this on numerous occasions but they never bothered to even respond to it. Instead we had to use third party tools at literally the last moment or else I would have never provided my key as it was the only way I could get my address at that time. I'm not saying it's the case but it's almost as if it was planned to be like this. I never fall for phishing scams so that itself should tell you something but crypto is a new world where things function differently.
Further they still haven't said anything about this incident, only releasing a general safety bulletin afterwards. We don't know if they are tracking down the individuals involved or provided their information to the authorities. I don't buy the hacker/impersonator excuse they gave for a moment before shutting down the site. You don't run away if you are truly innocent. Firefox gave no warning about the insecure certificate when the site was functioning. It was only after the incident that it complained so that is just a convenient excuse they tried to implement after the fact to try and cover their tracks.
The BTG team should do the right thing here and compensate us from all those blocks they mined. If they don't do it I hope this continues to haunt them till the project eventually dies.