It's impossible to see an exchange with a highly profitable business model (which is being a shitcoin exchange that doesn't care about anything) suddenly shift to a less profitable business model (which is being an honest and professional exchange that does care). It would cost them a lot of money to provide proper customer support, have high security standards, not listing any shitcoin for the sake of making listing fees, etc.
Yobit is banking on the fact that the more reputable exchanges still allowing people to use their platform without KYC are shrinking with the day. People eventually will end up begging Yobit to accept them as user.
it doesn't take that much effort to improve their platform though. and it doesn't have to reduce their profitability either. they just don't want to bother probably because so far they have been getting their customer and they are satisfied with the result.
all they would have to do is to add clear indicators on their massive number of wallets about which one is disabled and which ones are empty. that simple change would solve majority of the problems since most cases are people who deposit some shitcoin or buy it and want to withdraw and their funds get stuck in limbo because the wallet is dead and the interface doesn't show you any warnings. when they contact support, they aren't going to tell them "we fucked up and our wallet is dead" so they remain silent hence making everything worse.
apart from relying on those looking for no KYC, they have been mainly relying on newbies that joined their platform and fell for their absolutely fake pumps on those dead coins that they only list. the main purpose of their signature campaign was also this. they force users to sign up on their exchange and fool them into trading and losing more money while contributing to the total volume.