AFAIK this fucks with artists, not Spotify.

Spotify doesn’t pay artists a flat amount per stream. Instead, Spotify’s profits are split between artists based on their streams.

By playing a bunch of songs, all you do is give those artists slightly more, and other artists slightly less – at least in theory. In practice you’re probably not steaming enough to change overall percentages.

So if anything, you are moving profit to support the artists that Spotify is promoting by putting in your ‘radio’. Which likely means instead of going to small undiscovered musicians, it goes towards popular established ones that Spotify assumes you’ll like.