Hey there ! maybe I can add my stone to the bridge and contribute to this topic
I hopped on Big blue a month ago or so and so far all has been running smooth for me.
Their admin and staff are friendly and redcorner helped me to settled a dispute in my favour as the vendor failed to delivered on time.
I don't know why people say they can't login or withdraw, there are already quite a few famous vendor out there doing good business from what I see
Anyway, keep it safe