They limit trade with NK, unfortunately that probably does contribute to impoverishing the people, alongside NK's own practices doing so, but as I understand it

They limit trade with NK, unfortunately that probably does contribute to impoverishing the people, alongside NK's own practices doing so, but as I understand it the point of sanctions is to stop material aid (trade, gifts, tech sharing etc) that would be used to empower the NK, which includes their military and nuclear capabilities. I don't know if the US itself allows food or medical aid to be sent, but I do know that NK receive a lot of food aid. Honestly I don't know how to feel about sanctions more generally, whether they help or harm the citizenry - but I'm not convinced that enabling the NK government to transact with crypto would lead to improvements in the regular people's lives, compared with them having greater access to military equipment.