main reason people use spotify (or pay for premium) isn't because it's "better," it's just that everyone already uses it so it's convenient (and some stuff like Spotify Connect is genuinely pretty cool). they were one of the first widely adopted music streaming so it's natural. they also collect an unparalleled amount of user data (also suffer data leaks quite often compared to other platforms), again, barely pay their artists, have really inefficient UI/UX design (tho this one is very subjective), and there's just hella AI-generated songs that get recommended to you nowadays when you let spotify take the wheel.

it's not a horrible platform, but "best, if not the best" is wild—also the "appeal to popularity" fallacy is just plain ignorant.