A crypto owner which lives in a country with a crypto ban, has to convert his coins which he want to sell into something which is legal to sell, like gold.
The conversion part is actually one of the main problems... How can you be sure that you're not going to walk straight into a trap when you're about to sell it in exchange for gold or something else?
- In other words, it's easier said than done, and I didn't even include the other issues [e.g. tracking possibilities and etc...]!