The complexity is not the player, it's the whole business... Winamp didn't have recommendations, tack on another 100-200 people working on data to surface those. There are close to a 100 markets being offered content with licencing deals, each with different regulations.
There are internal platforms, infrastructure, development, each platform requires team(s) to maintain, and develop them.
What's the size of the largest tech company (with a single product) that you've worked at? Just so I know how to translate how larger organisations work to a worldview that you have experience with.