this is a investigation from russian portal https://vestnik-jurnal.com/novosti/item/111232-bestchange-okazalsya-vladelcem-scam-obmennikov-coincraddle-prostovcash-getbit-i-coinumm

based upon this accusation

https://bitcointalk.org/index.php?topic=5322854.msg65402102#msg65402102
https://t.me/vchkogpu_ru/27514

in addition to My 100 XMR (30k usdt) stolen scam from here https://bitcointalk.org/index.php?topic=5523844.0

i am not tallking about many many small scams under 5k they did, there is closed chat on telegram where people cooperate in order to discuss what to do with bestchange scam