Could just be thanks to technology office politicking. Some senior engineer or manager says "I want to work on blockchain projects", invents a reason to do that within Facebook, or maybe their boss really wants to keep them there, and somehow they get enough buy-in to create Libra. Now they have a blockchain project.
This seems more likely to me than someone at Facebook saying "We need a our own money system," evaluating blockchain against a centralized design, and deciding for technical reasons that Facebook Money should be a blockchain project.
> Some senior engineer or manager says "I want to work on blockchain projects", invents a reason to do that within Facebook, or maybe their boss really wants to keep them there, and somehow they get enough buy-in to create Libra. Now they have a blockchain project.
This is pretty much how it happened. A Bitcoin fan started at Facebook, started from "how do we use a blockchain here" then came up with something to use a blockchain for, and recruited some executives who thought similarly.
Most of what's weird and dumb about Libra/Diem is because it was started by four bitcoiners, from bitcoin ideas. It turns out that ideas from a cryptocurrency that was started in order to evade government control don't play well in the heavily regulated environment of Other People's Money.
This seems more likely to me than someone at Facebook saying "We need a our own money system," evaluating blockchain against a centralized design, and deciding for technical reasons that Facebook Money should be a blockchain project.