If Bittrex are using KYC as an excuse to steal funds then that is extremely worrying for those that registered there before KYC was not necessary. Just to change the ToS and not allow users that want to remain anonymous a chance to remove their funds is nothing more than stealing.
it is important you can decide for yourself whether you want to enter into a business relationship with this company
or whether you want to accept changed conditions
or cancel them if you don't like them!
Soon the first lawsuits regarding DSGVO (Data Protection Regulation in EU - General Data Protection Regulation GDPR)
will come when more and more people are supposed to fill in these private data in this bunglingly made PDF
which is (allegedly) sent out by Bittrex via email link.
You can't even check if the document is really authorised by Bittrex!