In her Sept. 19 op-ed, “Crypto has hope — and a long way to go,” Megan McArdle shed an ambiguous gentle on the way forward for cryptocurrency, highlighting potentialities and breakthroughs, resembling ethereum’s new energy-efficient mining methodology, whereas acknowledging the challenges that it faces. Although I agree with Ms. McArdle’s opinion that cryptocurrencies have a lot bigger issues than the environmental considerations, Ms. McArdle didn’t stress the largest impediment of cryptocurrency: adoption by nationwide governments for the sooner, simpler and safer transactions it guarantees.