I know and I don't mind, kids can have a laugh. I am just annoyed with the fact that most recommendations after are also terrible. There are plenty of popular songs they will also like. The medium is the message.
Spotify decides what is in these recommendation lists. Not actively prompting junk would have my preference. Just like you don't want school cafeterias only serving fries and donuts.
There isn't a switch you can flick that adds taste to your kid's listening habits. There isn't a single paid music service that offers that, outside the parental controls switch to disable explicit music. Spotify won't change this because their highly-relevent feedback loop is why people (myself included) still pay for their service in the first place.
I wish you luck, but being angry at Spotify for not changing your kid's listening habits is a bit solipsistic.
It is not an impossible problem. Most of these song sound like they have been recorded in someone attic. These are not songs published by a record label.
Just make the recommendation chance smaller for privately published 'songs', with core theme of poop and no adult audience. Something like this, some engineer at Spotify can do this.