Or wait until the fare inspectors have gone somewhere else, and board the next vehicle, and repeat the process.
Not only that, but since credit and debit cards, including Apple Pay and Google Pay, can be used as payment too... do you want to confiscate them? Do you want to confiscate people's phones?
Quick, no tolerance solutions to social problems always sound really good, until you stop to think about them for more than 1.5 seconds. It certainly doesn't pass any kind of practical or legal smell test.