Well this is an interesting topic. Note that the question was, "What SERVICE do you use for music playback? but the survey was more of “What do you use for playing music?”
My answers are different. A lot different.
When I really want to listen, I use vinyl. I have a VPI Prime Scout turntable, with an Ortofon 2M Bronze cartridge. This goes to a Musical Fidelity phono stage and a Wyred4Sound STI-1000 integrated amp.
I have Rectilinear III Highboy speakers (Stereo Review’s Julian Hirsch gave them his “Speaker of the Year” award in 1968, although mine are 1972 vintage). Or, I can push the output to some oldie but goodie STAX SR-5N electrostatic earspeakers, or run the signal to a that new HeadRoom Standard headphone amp to listen to other headphones.
But yeah, music services… That’s a freakin difficult question these days. I have some SONOS in this house and the house my wife inherited from her folks. I used Deezer, but pulled the plug on it. Need Apple Music for our iPhones. Got that. Have been considering Tidal, but am really waiting for a bit to see what settles out in the current format and high-res streaming scene.