Earlier quoted context omitted.
It is the idea that money is credit / debt. https://en.wikipedia.org/wiki/Credit_theory_of_money As for Bitcoin. Who cares if it is a bubble or a ponzi? People make money and gambling is a part of human nature. People are stuck at home and cannot go to the cinema. Investing in Bitcoin and watching Elon's twitter is an ok replacement for now.
OK I will bite. > As for Bitcoin. Who cares if it is a bubble or a ponzi? People make money and gambling is a part of human nature. People who want to use it as a currency and people preferring to avoid losing their investment in a dumb bubbles. (it is more OK if it is a dumb gambling with what someone is considering as entertainment funds, but nearly noone is doing that)
In the money as credit model, the money supply expands and subtracts with economic activity. And the best suited money have price stability so the market of credit can focus "pricing" risk correctly.
This model of money could be supported by some kind of cryptocurrency, however right now the investors don't seem to have an appetite for sponsoring that sort of thing.