Honestly, the only people using these will be the rich wannabe-redneck republicans who like to post their gun collections on instagram. It’s an opportunity to virtue signal your gun fetish and nothing else.
Vending machines are great for when you need a small amount of something on the spur of the moment–but kinda worthless for something like bullets (presumably, if you’re planning ahead to have a gun on you, you would also have thought to stuff a few rounds in your pocket at least) When they start selling actual guns, then I’ll be worried.