Although "some countries don't consider bitcoin as "legal" (or illegal)," this enables law enforcement agencies of these countries to take everything related to crypto using force and get away with it just because this stuff is not regulated and, as such, these actions might not be considered as "illegal." They justify it to the media by "combating and preventing world terrorism" and "keeping their citizens safe."

Besides, every resident, in most countries I believe, MUST pay taxes on every kind of income they earn. Do you believe the gov-t is happy to lose its chance to get some additional "contributions" (taxes, fines, penalties, etc.) to the budget? I don't think so.