What if Zuckerberg is simply a very idealistic person who happens to have full voting control of one of the largest corporations in the world, and insists on pushing it to idiosyncratic ends? This is a guy who a couple of years ago decided that "we will cure all disease" was a non-ridiculous goal to put his and his wife's name on.
A lot of the complexity around Libra can be explained as Zuckerberg pushing for unfettered access to the financial system for everyone, and the many smart legal and technical minds at Facebook trying to protect the company from the regulatory and criminal nightmare such a system would pose in practice.
I may be wrong in this analysis, but in general I think we spend too little time analyzing what vapid thought may have come into Zuckerberg's head this time around, when it is a perfectly sufficient explanation of Facebook's behavior. In this model, the complexity and subtlety of the strategy come from people around the Great Leader trying to mitigate his vision, or adapt it to their own bureaucratic or ideological ends.