Enlighten us. The DMA is about improving competition by forcing gatekeepers to share their toys and play nicely with other companies.
Imposing a fee on your direct competitors that you don't have to pay when competing in the same segment is exactly the kind of anti-competitive behavior the DMA is meant to address. There's a separate ongoing investigation into the Core technology fee.
Mostly it seems to me that the DMA is about Spotify being upset they don’t have an even bigger monopoly on music streaming and EU bureaucrats feeling annoyed that tech companies didn’t take them out to nice dinners in Brussels before releasing products.
Spotify pays Apple no money for inventing and distributing the product upon which their entire business is premised (internet connected mobile computer). That seems pretty unfair to Apple, though quite pro-competition!