In the past, selling music meant having access to capital equipment (the vinyl presses), access to marketing budgets, and access to the record shop inventories.
Now, music can "pressed" for free by Spotify, Apple Music et all, shelf space is not limited (computer storage is cheap!), and the marketing can be done online more cheaply (I assume).
With all these stories of successful artists in the past (like Erroll Garner) and in the present (like Taylor Swift) being chained by their record companies, why do present day artists sign with a record label?
I'm sure I'm missing some key facet of the business, what is it?