The Monty Hall Problem, a side-by-side simulation

I saw a cool version of the Monty Hall game here recently: https://monty.donk.systems . This is really cool! But I had an itch I wanted to scratch: rather than manually test out the probabilities, I wanted to run two games side-by-side: one where a switch happened and one where a switch didn't happen. Then, running those over and over, we should see the overall win percentages converge to 66.7%…