It also says marketing, so who knows how much of that is actually for research and development.
I imagine spotify could research how to make their data centers and delivery more efficient, music suggestion algorithms, or just in general how to best retain and aquire new customers.
I release independently and I earned a whopping $43 for 50k+ streams (so far). Sure, 50k isn't much compared to mainstream artists, but $43 isn't much either.
It's revenue share based on how many streams you get. Big record labels can probably negotiate a better share, but if you sign to one there's no guarantee you will actually see that extra money.
Record labels ripping off music artists was incredibly common in the time before streaming, so I imagine it still is today.
That's about what YouTube creators would get for the same amount of hits, which still doesn't make it a lot but I think it's an interesting comparison.