Who cares? Just set up kiosks and give gift cards to anyone that votes. Pick the key districts (i.e. where people are likely to vote D but have low turnout) and you could easily push the electoral college over the tipping point for a few billion.

I saw someone recording a video of themselves selecting the choices on the voting kiosk. No one is going to stop you from doing that, nor would it be practical to try.

Pretty sure that is illegal, wouldn't be a major complication to add a metal detector outside voting booths.

That would be considered voter suppression by lots of people. Also very expensive.