Since exchanges have begun blocking funds also on the basis of how “clean” they "think" bitcoins are or not, it has become increasingly dangerous to use centralized exchanges. They strive to make users afraid to withdraw funds to their wallets at all, so that later their coins will not be recognized as "dirty". They don't just want to get all our bitcoins and manage them themselves, they want to intimidate users into not wanting to get bitcoins outside of centralized exchanges (where it's not real bitcoins). Real bitcoins are only inside the bitcoin blockchain and nowhere else. And centralized exchanges are trying to gain control over real bitcoins with their division of bitcoins, but they still won’t succeed!
Yeah, definitely they won't succeed. They may put some burden and problems that many are going to be skeptic of what bitcoin is and they'll drop it down because the regulators and even the exchanges are implementing strict policies towards users. Another thing is, if they want a customer to freeze their funds, they'll do no matter what the reason is. They can always tell a lie and a thousand reasons why they're doing that because they've got policies that couldn't be disclosed to the users as there's always the pressure behind their back made by the regulators.