Y'all forget who interscope is. They are owned by universal. Who owns def jam. Along with geffen. Capitol. And a bunch of other labels
Now I can't speak for other rappers NOT under the umbrella. But if someone at universal calls and says "look fab, Kendrick making us money, you....... Not so much. So if you fukk with our money maker, welcome to never putting out another hit or having us authorize you to do a feature, show, or anything else"
What you think he gonna do? And yes. Once you sign that contract. Labels own you. They can get anything shut down. You are their property. "Appears coutesy of....... Label"