I have to admit that when I first started to read this, I thought it would be some egregious thing that the guy did, but all that happened was that he returned his car several hours before the two-week period was over that he had rented it for. And unfortunately, Budget charged him an extra $595. It turned out they were within their rights, although its a pretty crappy thing to do (and then they refused to respond to his questions about this charge). They also charged him border fees when he didn't actually cross the border. (NOTE: I am editing this to add that this was because of a mistake in booking he made that could easily have been corrected—read article for further information and tip in how to avoid this).
According to the article, both of the above are something that every traveler should look out for and be aware of. The first relates to Budget and their policy, but there is also a second issue about the border crossing that can be fixed by just using the correct language when you're searching for "Geneva."
https://www.nytimes.com/2026/03/26/travel/budget-rental-car-discount.html?unlocked_article_code=1.XFA.EGJ6.AB-ebLZx3Y6Y&smid=url-share (article is unlocked)