I'm certainly aware of soy allergies...........If I were claiming that my products were soy-free, or did not contain products that contain or have come in contact with soy, it would be a concern. I DO NOT DO THAT, as I am in no way equipped to make such a cake.
Anyone receiving a cake from me receives written notification that my cakes are not suited to ANYONE with a food allergy or sensitivity, as all of my ingredients and tools have come into contact with and/or contain common allergens such as soy, wheat, dairy, etc. Since I can't write that on every slice, it becomes the burden of the allergic individual, or their parent, to determine if the cake is "safe" for consumption.
I'm not food allergic, but I would believe that those who are must be very careful about their choices, ask pertinent questions, and pass on consuming something that they cannot verify is safe for them.
I chose 100% soy wax because soy is an edible product and paraffin is no longer considered as such.
I think it's quite obvious that if anyone is claiming to make soy-free cakes, they certainly should NOT be using soy wax to coat their boards............
As for plastic glitter, no one should be consuming it, either knowingly or unknowingly. We now have micro-plastics in the food chain, in particular in fish. It's bad enough that it's in things that we can't see and can't label as such. No one needs to be deliberately feeding it to anyone.