It seems to me the problem its solving isn't efficiently 'mining' the currency, its efficiently transferring small amounts of money. If there was a way a website could present a button I could use to flip them a penny (without a complicated setup or previous relationship with them) on my way thru if I like the content, I'd smash that thing all day long.
The telling thing is that people are seriously considering a system that wastes 97% of the money in the tiny transaction to easily transfer the 3%.
Stealth browser-mining lets everyone skip all the genuine attempts at transferring value and go straight to microscams.
Edit: hoisted body of comment: "Unsolved, difficult problems of micropayments"
- pay before viewing: how do you know that the thing you're paying for is the thing that you're expecting? What if it's a rickroll or goatse?
- so do you give refunds a la steam?
- pay and adverts: double-dipping is very annoying
- pay and adverts: how do you know who you're paying? A page appears with a micropayment request, but how do you know you've not just paid the advertiser to view their ad?
- pay and frame: can you have multiple payees per displayed page? (this has good and bad ideas)
- pay and popups: it's going to be like those notification or app install modals, yet another annoyance for people to bounce off
- pay limits: contactless has a £30 limit here. Would you have the same payment system suitable for $.01 payments and $1000 payments? How easy is it to trick people into paying over the odds (see refunds)?
- pay and censors: who's excluded from the payment system? Why?
Essentially the problem with micropayments is microscams.
Part 2: business model problems!
- getting money into the system is plagued by usual fraud problems of card TX for pure digital goods
- nobody wants to build a federated system; everyone wants to build a Play/Apple/Steam store where they take 30%
- winner-take-all effects are strong
- Play store et al already exist, why not use that?
- Free substitute goods are just a click away
- Consumers will pirate anything no matter how cheap the original is
- No real consumer demand for micropayments
=> lemma from previous 3 items: market for online goods is efficient enough to drive all marginal prices to zero
- existing problem of the play store letting your kid spend all the money
- friction: it would be great if you didn't have to repeatedly approve things, such as a micropayment for every page of a webcomic archive. But blanket approval lets bad actors drain the jar or inattentive users waste it and then feel conned
- first most obvious model for making this work is porn, which is inevitably blacklisted by the payment processors, has a worse environment for fraud/chargebacks, and is toxic to VCs (see Patreon and even Craigslist)
- Internet has actually killed previously working micropayment systems such as Minitel, paid ringtones (anyone remember the dark era of Crazy Frog?); surviving ones like premium SMS and phone have a scammy, seedy feel.
- accounting requirements: do you have to pay VAT on that micropayment? do you have to declare it? Is it a federal offence to sell something to an Iranian or North Korean for one cent?
The telling thing is that people are seriously considering a system that wastes 97% of the money in the tiny transaction to easily transfer the 3%.