Is this encouraging governments to insist on access to Signal, adding risk to their core product? Assuming govt haven't already, or that number is limited, adding hidden transactions seems a great was for increased government attention.
Side point, I think one of the greatest and less discussed risks of crypto is government. Its hard to see them allowing loss of currency control. Currency is so economically important for control & profitable e.g. There much talk the support on the attacks on Libya/Gadhafi was in part due to his desire for an independent currency. So unless crypto spreads so widely pre-regulation its politically unviable to move against, I wonder if we will see governments step in against crypto, at least as a day-to-day transaction option at some point.