This is all about respect.
The reason he's mentioning hip hop specifically is because of how they tend to use samples. Believe it or not, most artists aren't into someone taking the core of your song and just singing on top of it.
What he's saying makes total sense. The Weeknd deserves to get sued up the ass for this one. If you ask, you better comply because the artist made their decision.
"its got fuk all to do with money! As most of them are hiphop artist that are skint." sounds like the most respectful statement ever.