[Zr01]

Manga Library Z, a manga archiving site that distributed old and out-of-print manga for free has been forced to close down due to all major credit card companies refusing to provide payment services. If some hypothetical widespread decentralized payment system can prevent scenarios like this one from happening, then it would be worth the "enormous waste of resources". These days, you're essentially relegated to a non-person if card companies stop allowing you to use their services.

[Ma8ee]

Cryptocurrencies use between 0.6% and 2.3% of all electricity in the US [O]. I guess those manga are very important to you.

It would be order of magnitude more efficient to send couriers with cash to pay for those instead.

[0] https://www.eia.gov/todayinenergy/detail.php?id=61364