I just listened to the Yung Gravy song. He essentially just raw samples the song while using something to muffle and minutely modulate the sound for the introduction.

There’s no differential interpretation here, just a raw recording sample with some aftereffects. Very much in the same vein as “ice ice baby” and “under pressure.”

I don’t think Gravy is going to win this one. He’d be better off settling and/or giving Astley or a charity of his choice the song royalties.