Start it from one song and it plays what fits.
Start it from your playlist and it plays to your taste.
One song is all Slippy has to go on, so it guesses from that one thing.
Whole songs play through YouTube. Connect it once and you are set.
One song is a guess. A whole playlist is hundreds of songs to learn from, so the radio follows what you actually like instead of wandering off.
Every music app plays you more of what you already like. Slippy plays you what you have not found yet.
It follows what real people listen to side by side, so it turns up bands no genre list would ever put near you. Everything it finds is new to you.