One potentially huge market is online payments and small transactions. If libra is embedded into the browser, millions of blogs could start charging for frictionless access to their content, and thousands of games would improve their experience and revenue. That s a huge and largely unserved area, unless you think that entering card numbers and private data with every spent penny is a good situation. I think Libra is going after this kind of use cases, the ones that are not possible today. If that works, and it catches on, then yeah, they ll go after the 0.5% because people will want that too.

A blockchain is also a digital signature, a verifiable programmable general purpose ledger for smart contracts. Just giving each FB user a wallet id, even without money, has a lot of potential.