Now.. and I am speaking just from the perspective of trying to achieve specific goals ( and accepting a level of pain for what those goals can demand ), if there was ever a possibility that US may ban/fully sanction bitcoin use, this actually might be it.
They don’t need to ban bitcoin use - they just declare paying “insurance” or “tolls” to the Iranian government to be a sanctions violation, irrespective of the means of payment. Then this becomes a complete non-starter for any US company, and any non-US company in nations where the US has significant influence (i.e. most of the West)
I get where you are coming from, but that assumes .. the old world order. Not to search very far, China told its refineries only last week to ignore those particular sets of US sanctions ( and more importantly, we did not hear anything about it since Trump's visit to China ).