The last time that the same thing happened wherein lots of videos about cryptocurrencies were deleted is just last year and YouTube have claimed that it was just merely an accident on their part and have made it a point to recover only some videos on their platform. Now the same thing happened again and I guess this time it is now a real deal because not only the videos have been cleared out but the entire channel already. Maybe YouTube must take notice on the account owner before doing such actions so that there would be some negotiation to happen between two parties and not just delete the channel and videos without any notice coming from them on which channel owner are just being surprised that their channel was already deleted.
I don't exactly know if there is any statement YouTube has released on what is its stand about cryptocurrency because it is now the second time around that this happen and they must serve a valuable explanation why such thing happened.