Well, think the reason is that they don't have any active nodes to process the withdraw
I can confirm this issue. I went over to Yobit and saw that I can buy up tons of PWR at about 1 satoshi. I already had a few thousand in my wallet there so I synched up my local wallet and tried to do a withdraw. The PWR withdraw at Yobit isn't processing and gives a message that it's in cold storage. I submitted a support ticket and got back the following reply from them:
"The wallet is in maintenance mode and will take some time to fix. Sorry for any inconvenience. Be sure to check the wallet status before making any withdrawals."
It's going to be imperative that the coin is transact-able on at least one exchange or the coin will be dead in the water for sure.
yobit is full of crap.
if they didn't have any working nodes the wallet would be way behind in block height and it isn't.
they are using cold storage as an excuse for who knows what. maybe they are staking the coins themselves.
it would not be the first time the pulled shit like this.
This has been the ongoing saga of yobit since it opened.
If the coin wasn't already listed there i wouldn't even go near that place.