first, because contractual relations are more predictable than solicitations. Two, because it's tedious for your possible customers.
This was the role publishers filled; building a market and curating content. Unlimited digital distribution has upended that, but without providing a better alternative to content creators. Yes, it has opened new markets like YouTube vlogging and so on, but that's not a good thing. It's much harder to monetize quality content and privileges the shallow and sensational. You end up with a bimodal distribution of very high-budget quality content (ie big budget movies with famous actors), and tons of low-quality content, and very little in between.
That doesn't make for sustainable consumption economies, but it's not clear what's on the horizon to replace them, so you're storing up another economic crash. I predict the upshot of this will be that as intellectual property rights and the ecosystem that existed around them (which sustained far more people than the cartoonish stereotypes that prevail here) have crumbled for all but the most powerful actors, something similar will happen with other contractual and property relations.
https://hbr.org/2014/01/income-inequality-is-a-sustainabilit...