https://www.reddit.com/r/CryptoCurrency/comments/dgirhu/do_not_use_bittrex_source_of_funds/

According to Reddit your account is frozen and you'll have to provide the info if you even want to cash out. That is some bloodsucker bullshit right there. What a gross invasion of privacy for something that is none of their business. What stops you from lying and saying you're a custodian of the funds for friends and family? Are they then going to tell you to get that same information from every person whose money you protect? Pretty BS.