In some cases, commercial considerations, such as the cost of content or whether we can monetize it, may influence our recommendations. For example, Discovery Mode gives artists and labels the opportunity to identify songs that are a priority for them, and our system will add that signal to the algorithms that determine the content of personalized listening sessions. When an artist or label turns on Discovery Mode for a song, Spotify charges a commission on streams of that song in areas of the platform where Discovery Mode is active (Discovery Mode is not active in our editorial playlists). This signal increases the likelihood of the selected songs being recommended, but does not guarantee it.

so, at the very least, the recs you get are definitely not organic, and favor major labels, rich folks, and if Spotify can make any money off streaming the track in the first place

not saying the algorithm doesn't get it right most of the time (they'd be shooting themselves in the foot if it was all sponsored), but if it's favoring big labels and drowning out everyone else in the name of revenue for Spotify, I prefer to choose other ways to find new stuff. if Spotify needs more money to pay the bills, imho they should plainly be asking the consumers up front