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It was helpfully explained to me by someone on discord that they're doing those weird reactions to "gifts" sent to them by their viewers (earning them money I assume) by pretending to eat the ice cream/chillies or whatever on live streams which overlay the gifts on the screen.
it's weird as fuck (especial when you see the videos without the overlay like in the pic above) but seems like a fairly astute way of extracting money out of your audience if you're one of these influencer types and clearly it works.
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https://youtu.be/5a77WgZN22o