The fact of the matter is “number of core platform services offered” does not matter when determining if the DMA applies. If you offer just one “core platform service” and meet the (clearly designed to hit US companies) thresholds, then the law applies to you. See booking.com as an example.
So again, why is music streaming not a core platform service? It meets all the definitions you listed above.
Also, even giving you the largest benefit of the doubt possible, there is no universe where Apple has “chokehold” on games, music, video streaming, or digital advertising. (I’d argue it doesn’t have a chokehold on any of them, but can at least see an argument for digital payments and application software).