You should realize that this means all BTC you own and all the gains you accrue can be clawed back from you in the future.

Theft of BTC is very widespread even without the exchanges and with the Mt.Gox fiasco (and more to come because the government + banks can bankrupt all the exchanges with regulations, fines, placing holds on funds, etc, or even send in secret agencies to steal the keys).

For those readers trying to rationalize away the contract between accounts holders and Mt.Gox, you have no legal standing. Bitcoin is not legal tender. So many governments have spoken on this already and declared it to be a commodity. Clearly we are looking at a big legal mess with Bitcoin which the government is going to have to solve holistically. Now you see I was correct from the very beginning in Bitcoin : The Digital Kill Switch.

All you Bitcoin millionaires are going to be Bitcoin jailbirds and destitute.

For those who are rationalizing away the chain of ownership (I explained upthread) due to that the lack of physical nature to Bitcoin, you don't have any chance of winning that argument. If it wasn't owned, it wouldn't have value that can be exchanged. Even if we are trading fungible tokens in a pool, the tokens are still owned. Cripes, are you guys totally ingenuous or ignorant.