I'm not sure there is a problem if a proportion of the listeners don't recognize they are listening to slop. I do, however, think its a problem if Spotify is giving preferential treatment to slop, as is claimed in this post. I also would prefer a system that better supported musicians, while having the ease of use of Spotify.
this is perhaps the crux of the matter!
Very few people in my social circle whose taste in music I share. The majority of them don't even have a "taste" and content with whatever their car-radio pumps out.
Does that drive me mad? Mildly.
Appreciating and recognizing great music is a deeply personal experience.
Like appreciating different culinary tastes that requires training and exposure (ideally from a young age), it's also hard work (the older and more settled our tastes get).