Or, it is supply and demand. The quantity and quality of freelancing / gig work / task work services where bitcoin can be earned is overall significantly sub-par. There are literally hundreds of millions of potential, qualified individuals with the desire to earn bitcoin using nothing more than their time and talent (which, without capital, is about the only way one can earn bitcoin).

But their options are severely limited:

Freelancing platforms which pay in Bitcoin https://cointastical.medium.com/freelancing-platforms-which-pay-in-bitcoin-e38be56166df