> What's your evidence for this?
I've used it for that. People use it on darknet markets for value transfer. I have seen many people claim to use it in Venezuela, though I can't confirm that (one of them posted in this thread [1]).
> Bitcoin's total TPS is circa 2-3. [1] And presumably a small fraction of that is actual money transfer. In contrast, M-Pesa, a digital money system that started about the same time and has millions of users, has 100x that volume and is growing rapidly. [2]
That's no longer true. The lightning network increases that to effectively infinite TPS. The infrastructure of nodes isn't that great yet, but it is now possible in principle for Bitcoin to scale to an essentially arbitrary throughput.
> So I'm entirely skeptical that it's better for any significant market than even legacy money transfer methods, let alone trying to compete with newer tech.
That's a fair skepticism. Though not due to slowness/throughput, as that problem is solved. And not due to environmental concerns, because that problem will be solved (in Ethereum, not Bitcoin). The legitimate objections to cryptos I see are:
1. It's not clear that decentralization, uncensorability, and irrevocability are really properties that people need. provides a value anyone really need.
2. Deflationary assets are subject to boom/bust cycles that can be toxic to modern economies. Crypto assets tend to be deflationary, and as such may not, over the longer term, serve effectively as global currencies.
I think those two points are the core of any serious objection to crypto. I believe that in the case of #1, the architectural change it would induce in our financial system is worthwhile, and consumers will feel the effects of that rather than the benefits currently stated for crypto. As for #2, it's a legitimate concern, and it may ultimately make them untenable, but we'll just have to see.
[1] - https://news.ycombinator.com/item?id=17495476