If we don't want to end up behind bars, we must abide the law.  If the government implements that Bitcoin is illegal and people using such cryptocurrency is committing a crime then as a citizens of the country we have to follow the law but it does not mean we will just follow it blindly if we feel that it is oppressing every individual, we can file a petition along with the people who have the same belief for the government to consider revising such law.  It may take some time but I believe eventually someone from the position will consider the petition about cryptocurrency if the reason is good enough that it won't harm the country's economy and its citizens.

But in the case presented by @OP, the woman is surely committing crimes and there is evidence of fraud, tax evasion, and money laundering.  It is sad that this woman use cryptocurrency to cover his dirty antiques until exposed and apprehended.