[stickfigure]

"Biome recolonized by the bacteria of hundreds of other people who also put their dirty feet on the plate"

[msandford]

It's a wonderful theory, but alas. Copper is aggressively antimicrobial.

https://en.wikipedia.org/wiki/Antimicrobial_properties_of_co...

[Retric]

Antimicrobial isn’t the same thing as sterile. You can culture bacteria after swabbing a copper plate people are touching.