Since 12.2020 I have instructed MyChargeBack via Georg Rusche to recover my money (3750 via MasterCard + 6000 via Coinbase/Bitcoin). MyChargeBack seems serious to me.
As soon as my case closes, I will write a new conclusion here and adjust the stars.
Boris: Thank you for providing valuable feedback on our services so far. We are looking forward to a positive outcome in your case.