I honestly don't know...but isn't this sort of like when toasters first came out? I don't know for sure, but i guess toasters maybe didn't have the UL symbol...and probably some accidents happened, maybe house fires and such? Fast forward to nowadays and toasters tend to be pretty safe - well, if used properly and purchased from a reputable manufacturer who has been tested via entities like UL, etc....So yeah, maybe a little extra cost...but wouldn't we want at least some modicum of a signal of quality assurances for IoT devices - like we have for things like toasters?