For sure this can be some centralized trading exchange. Where a lot of people using right now. I am also curious what the crypto firms owners will do to their customer once at the beginning or some users sign up on their platform and on their Term Of Services, there is no yet Know-Your-Customer (KYC) Policy, but later on they will required all the users new or old to submit one.
So for this, the fund will be freeze. I also tried this before on one exchange, I needed to submit a KYC first before I can withdraw my Bitcoins.
That's why Decentralized Exchanges are much more advisable to use now.