So is this true? Or just an accusation? Maybe the didnt somehow comply with something. I havent tried bittrex yet but i was planning to its best to read this kinds of before doing so.
No, not an accusation it's for real but it's a matter of compliance to what IRS is pushing them. You can still use bittrex as they are one of the most reliable trading platform.
That disabling of account has a purpose and they don't disable a user account if he's got upgraded verification. But if you think it's not worth for you to use them, then don't use them. Everything seems to be fine again if most of their users gain the control again with their accounts.
This is one of the reason on their support site:
"There are other scenarios that cause a wallet to be disabled. In general, the wallet is disabled to prevent users attempting to deposit or withdraw to a wallet that may not be functioning properly."