Another important distinction is often overlooked.
A recording contains different copyrights. At the most basic level, there is the sound recording (master) and the underlying musical composition.
That means the money generated by streaming does not necessarily go to one person. Master royalties may flow from the streaming platform through a record company or distributor to whoever owns the recording. Publishing royalties relate to the composition and may ultimately flow through publishers, collecting societies, mechanical-rights organizations and other entities before reaching songwriters and publishers.
Spotify itself makes an important distinction here: the platform says that it pays rights holders rather than artists and songwriters directly, after which payments depend upon the agreements those rights holders have with creators.
This helps explain something that can otherwise appear contradictory:
Two artists generating exactly the same number of streams can receive very different amounts of money personally.
One artist might own the master, control the publishing and distribute independently. Another may have a record deal, multiple writers, a publisher, management obligations, recoupable costs or other contractual arrangements.
The stream count may be identical.
The economics are not.