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One issue with parchment paper is the max temperature rating is 425-450 and I've gotten best pizza crust results with temperature of 500 with my oven and that scorches the none food covered parts of parchment paper when I tried it. I don't know if it's toxic when overheated and burned like that but it is super convenient for lower temperature usages.

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At my house we routinely scorch parchment paper (the edges away from food) and use it for all sorts of purposes. It should be perfectly safe because the coating is just silicone. However, white parchment paper has some amount of dioxin in it (I'm not sure how much), which is bad stuff; possibly also fluorine. I've also heard that some parchment may add plastics for extra non-stick, exposing you to PFAs and the like.

Probably a good idea to stick with the hippie-looking brands / made in Western countries like If You Care, which use unbleached paper and silicone and presumably don't douse the paper in other chemicals.

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