I think it won't lead to backdoor cryptocurrency regulations(I hope). I think trump's move is a wise choice because who the heck will believe in Maduro's claim that it is backed by oil? Also, the fact that it is centralized with Maduro in control of it is also bad which I think is the most probable reason why trump have given an executive order to ban Petro transactions. Maduro can try getting Petro in a free market, I think it would have more value this way.