Crypto-enabled marketplaces can behave like open-source projects, outsourcing high-impact work to the community. You can end up with much larger virtual teams and scale a lot faster while having much lower fixed costs as you use the unsalaried community to do a lot of the heavy lifting.
In traditional marketplaces, startups must hire many richly compensated people in cash and equity to cover all of the functions of the company: product, development, sales, marketing, finance, customer care, etc.