Libra is targeted at developing countries

The international small amount transfer use-case is extremely rare and unlikely to take-off because of Libra.

In any case, you seem to be assuming Libra won't charge forex fees for converting between Libra and fiat currency. They have not said so. It is very likely they will charge.

I don't see any reason why the banks involved in exchanging Libra with fiat currency to behave any differently than they do today. They will play with the buy/sell rates to make money on both sides of the trade.

Not yet, but I've heard that this is in the works. The hardest part of trying to use UPI right now as an Indian expat is that you need an Indian phone number and your bank account should be linked to it.

Planet Money did a good episode on why the US system is so bad compared to most other developed countries. Mostly seems to come down to the huge number of small bank's you have, it massively complicates any attempt to roll out a new tech platform.

SEPA is over 10 years old now, and while not the fastest protocol, modern banks clear transfers in a couple of hours. Not bad for something that allows you to wire money to some 500 million people. And the newer SCT instant payment scheme is being rolled out as we speak.

Sepa is not instant but it's miles ahead of ACH

Calibra vs Zelle here we come.

That won't happen though. Capital needs to flow as freely as possible; and the current players at least make that work. Libra, however, has no substantive purpose in the long run other than to finally tap into the rent-seeking upper layers of the financial system. It seems to be the tech industry's fallback when they can't think of anything more innovative to do. Start up a financial services division, and tap into those delicious fees from the "underbanked".

Make no mistake; the data grab possibilities are real barring explicit intervention by regulators. Any advertisement company based on data collection for ad targeting has far too much potential value to reap out of actually tapping into the transaction details of user's. Having the "world's biggest social network graph" at your disposal on top of a distributed ledger from which can be derived a parallel graph of financial activity represents a gold mine in terms of panoptic levels of informational awareness.

People don't seem to quite get it yet that a big enough pile of seemingly unidentifiable data points can be combined to create something as good as a fingerprint or DNA strand. In government work, this is explicitly highlighted anddrilled into every employee, every year (at least at the Federal level).

Caveat emptor. Embrace your localized economies; beware of those seeking to add you to their "customer base" for the sake of 'your convenience'. They wouldn't be going out of their way to get you onboard if they didn't have anything to gain in the long run.