Just did the math.

There are around 917 wallets in YoBit.

From those:
20 are in "Delayed" status. That's around a 2%
573 are "In Mainteinance" status. That's around a 62%
324 are online. That's a around 35%. However this number is even smaller as some of those online wallets are running a "YoBit Fork" (yeah, that's even a thing now) and some others appear to be online but they throw a last time warning, not allowing users to withdraw coins.

More than 50% of wallets disabled on a exchange. It's ridiculous.