The screen inside Apple's new $1,999 folding iPhone is made by Samsung. And Samsung reportedly gets paid around $250 every time one sells. Kai Cenat found out on stream in Japan that Samsung had folding phones years before Apple did, and he could not believe it. Honestly, the screen thing would've broken his brain way worse. Here's how it works. Samsung Display reportedly signed a three-year deal to be the only company making the folding panel for the iPhone Duo. A pretty reliable supply…