It's nothing? That's why the US still does not have a single efficient electronic transfer system alike Hong Kong, China, Japan, UK and others? You are a total dreamer man.
Yes, it wont be easy but of course they can comply with money transfer rules.
There are literally thousands of banks and non-banks that do that.
FB has managed to track and target almost 30% of the planet. Creating a payment system with KYC and that bans certain places is nothing.
Of course, it wont be 'true' crypto, and they will hand over all their info to governments (and this might be why they would have no problem with this) but this will introduce billions to people to the world of 'crypto'. They will make transfers and get familiar with it. They will be able to deposit this libra (and this is a speculation on my part but I dont see why not) at crypto brokers and buy BTC. Yes they can do that now with cash but they have no idea what crypto is, once they learn and see how it works, to get involved in the BTC momentum trade will be a lot easier.
I say BTC makes a new ATH within 12 months. $30-$40K is a resonable target after the ATHs