Sad to see what has happened to your mind, Jorge.
Indeed. Like the other day when I suggested that stealing bitcoins by address spoofing would be a problem unique to bitcoin.
That's not how exchanges work. It's also about 1000x more complicated and risky and public than it needs to be to accomplish the supposed ends of this unworkable scheme.
There are many other ways to pay a bribe of course. But suppose that person A in Shangai needs to transfer 250'000 yuan (say = 100 BTC = 40'000 USD) to person B in Beijing without the payment being spotted by the police. Any scheme that requires complicity a third person is risky because he could be an informant or a blackmailer.
Can he use bitcoin exchanges for that purpose, without leaving a trail? Transfers of bitcoins are visible on the blockchain, so A cannot just buy bitcoins on an exchange, withdraw them, and transfer them to B: the conversions of BTC from/to yuan would be in the exchange's deposit/withdraw logs, they would connect to the blockchain transfers to trace the path. But if there were a way to transfer the yuan from A to B while they are inside the exchange, then...
Try to imagine a scenario where bitcoin is accepted world-wide, where you never need to go through an exchange into fiat.
Then you understand the potential of bitcoin, and the danger it poses to the status quo.