I agree that overpopulation contributes to this problem of overabundant supply, but it’s technology that empowers us to skip the middlemen and strike out on our own — which would be fine if we were all also empowered to consume as much as we like and to pay for all of those services. These days it’s easy to start a website and sell things we make, since doing so is practically free (it costs mainly time).
What’s not so easy is to sustain a middle class of consumers who can afford to pay for all those goods that are being sold. The internet provides much of it for free and there are more producers willing to start up a company based on the new technology, than there are consumers who make enough money or are willing to pay for those products to sustain the producers’ living. Theoretically, this could change, as we see from companies like Kickstarter and Patreon. It’s the return of the patronage system.