That's because trap music (the hip-hop genre) and EDM (which has a trap subgenre) were highly influential genres in the 2010s and their influence continues to be felt, even though the latter's heyday with its huge electronic music festivals has passed. Those genres quite often intentionally used robotic vocals as an artistic choice. Simultaneously, there's been a revival of synthwave and other '80s electronic music in terms of influence and style. "Stay" somewhat typifies the latter.