> Isn't that one of the most basic properties of supply and demand though.

The most basic property of supply and demand is that price is determined by the interaction of supply and demand, so a fixing the supply alone determines nothing at all about its value, which is why the incessant pumping is necessary. The cryptoproponent's argument that cryptocurrencies must increase in value because there are hard limits on their growth rate is a cargo cult version of the law of supply and demand made to serve the pump