i don’t mean to be argumentative but i haven’t seen many pennies become corroded. also copper pipes in houses I’ve worked on have held up really well. I’m pretty sure a copper water line is more likely to oxidize via galvanic corrosion instead of moisture.
buttons on a controller seem to be at much lower risk of corrosion with respect to pennies, water lines, etc.

I’m pretty sure finger oils would prevent oxidation. i don’t think it would be a big problem?

incorrect

ew

thanks for the wall of misinformation :p