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Still having this issue in iOS 17.3 on a 14 Pro… I only have this issue with YouTube in Safari and only with YouTube. I found a workaround, kinda. Works about 70-80% of the time. For me, the overheating only happens when my phone is locked. When I lock my phone, the media controls don’t show up about 90% of the time. I’ve noticed the overheating seems to start at that point. I have to unlock it and pause and play in the pip window.

Additional issue with YouTube in pip. The window also goes gray when I unlock my phone. I have to pause and play again for the video to show.
 
15 pro max and iOS 18 and still, using YouTube pip the phone gets red hot, apple what are you doing
 
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