An original purpose for Bitcoin and other decentralized value transfer protocols was to broaden access to and lower costs of financial services. In an article posted to Medium, David Marcus, co-founder of Libra, explains that the importance of developing better financial tools is greater than ever given the "fragmented infrastructure" of the legacy system. Marcus adds:
Long story short, building on top of existing rails and across disconnected payment networks won’t reduce cost, open up the market to more innovation, nor lower the barrier of access to modern financial services as much as building a new infrastructure with a very stable, high quality global medium of exchange supporting it.
Marcus explains how Libra is designed with an intent to meet this need, which he explains is an "ambitious route."
"Libra can be the “protocol” that will enable fast, cheap, and stable money movement across service providers, institutions, and people all around the world."