[CaptainZapp]

There is one huge difference between WeChat Pay and what Facebook plans. Namely, that the People's Bank of China[1] has an iron grip on all such systems used in China.

Facebook plans a global currency undermining any control of the national central banks and subverting national monetary policy. I don't think that any central bank will allow this to happen.

Add all potential KYC and AML issues and I'm not sure if the "move fast and break things" mantra is applicable in this case.

Money is not just a method of exchange in which the markets decide. The well being of countries is directly linked to monetary policy. I don't think that they really factored that in in their libertarian fever dreams.

[1] https://en.wikipedia.org/wiki/People%27s_Bank_of_China [1]