When you say that they will "trace" you by creating a database with the "official IDs" of their users, what exactly does this mean? What sort of information are the keeping? It doesn't seem like they have much to begin with...
If you want to trade above a certain volume, you have to provide them with ID in order to comply with MSB and money-laundering laws.
"Certain volume" is unknown and arbitrary. It really seems they're randomly blocking accounts and requiring IDs to release the money.