Why is it ethical for you to fly in a plane and run your clothes drier but not for someone in Afghanistan to buy food and protect their money by using bitcoin?
No one.
Don't use a strawman argument.
And independent of this issue: there are of course things which are objectively better for that person in Afghanistan and objectively better for everyone.
Your poor Afghanistan person might like to have less heat waves than Bitcoin because he might not have enough money anyway to save it away as Bitcoin.
Normally those countries use dollar or euro anyway. It's much easier for them than being able to remember a Bitcoin wallet
While I'm not an expert in Afghanistan politics, I follow the Russian war and don't think we should support them by providing bitcoins
What about using it to support democracy in Russia? https://www.reuters.com/world/europe/navalny-ally-urges-dono...
Therefore it's not my place to break sanctions my country opposes onto another.