Them locking up accounts like this is insane, force it upon all or dont.
They are not the first exchange to spring unannounced KYC requirements on their customers, and they won't be the last. It is thoroughly untrustworthy behavior to suddenly lock users out of deposit/trading/withdrawing, and essentially hold their coins ransom unless they agree to whatever ridiculous and invasive KYC requirements they want.
Banks as shitty as they are have a strict set of rules that you should follow, else their bank accounts will be terminated.
This is true, but if a bank decided that you suddenly had to upload selfies, pictures of your passport and driver's license, tell them your job, income, net worth, source of any additional income, any other accounts you hold, and all the other invasive nonsense some exchanges have started requesting, then there would be a minimum 30 day warning so that customers could rightly switch providers without penalty. No bank under the sun would get away with "We have seized your money unless you do what we say".