If a light socket only has 2 connections (thus not grounded) then how can they sell 3 prong (grounded) light socket adapters? How is this legal and safe? If it's grounded, then how does that work? e.g. Amazon's Choice in Light Sockets: https://www.amazon.com/Socket-Adapter-Polarized-Splitter-Converter/dp/B09R1H8FHN/
Or "better" yet, one that claims to be UL and FCC listed! https://www.amazon.com/Socket-Adapter-Listed-Polarized-Converter/dp/B0B433M3HN
How does the ground work exactly?