Fiat seems like the best option for anything illegal, it is strange to me how the media continues to claim bitcoin transactions are anonymous or untraceable when the open ledger design of its system suggests the opposite.
It baffles me as well. it seems, like this is the agenda to portray the cryptocurrencies in the most shady way possible.
Of course, these people have a clear agenda and that is to paint a very different picture -- a darker and not so desirable image -- for Bitcoin so that those authorities in the government will think twice in dealing with Bitcoin. In fact, this kind of connection many are assuming to be true, is what drives many government to doubt Bitcoin of what it can do to their economy and politics. They see Bitcoin as a way for the people to get empowered and for them to one day detach from the government. Though this can be a big possibility, the scenario can be extremely flawed because Bitcoin and cryptocurrency and the government can be partners for the good of the citizens and the economy. This is shown with how Japan is treating Bitcoin successfully.