What this truly mimics is a 'security' analogous to a basket of foreign currency traded as an ETF. Once you give them US $1 it is backed by a POOL of currency

What this truly mimics is a 'security' analogous to a basket of foreign currency traded as an ETF. Once you give them US $1 it is backed by a POOL of currency from multiple countries (i.e. the other people who have traded their currency for Libra). Once you decide to take your US $1 you will get back a different amount based on the underlying value of the pool based on the fluctuating FX market. May be >=<...no one will know. Given they are seeking to bring in "underbanked" people (i.e. the charitable patina on this operation) there will be a focused % of currency in the pool from countries with a high % of underbanked people. Logic says this will likely be less stable currency than say the US $, etc. Thus, your US $ will be diluted by "lesser" or more "volatile" currencies and will diminish the purchase power of your US $1. Conversely it will increase the purchase power of the lesser currency. Thoughts?