Toi: Some Rishonim (the Meiri maybe?) hold that they do so since this is just to be Yotzei a Safek which is already a Safek (I’m assuming this thing is made of plastic and/or glass with no real metal touching the food or being the Maamid) then we can use more lenient opinions by this Kinyan, unlike Mechiras Chametz which is already a weak leniency, so we throw every Chumra in the book at that Kinyan.
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