Why Are People's Z Flip Breaking?

Hi, I'm an owner of the Z Flip 6 for the past 2 years and I have a question. Why are there so many cases with people's z flip breaking? My Z Flip 6 hasn't seen any amount of damages except for very few minor scratches on the inner screen. I've used my flip with an extremely barebone case, and I don't think I "baby" my phone that much. I'd love to hear some theories on why some z flip creases crack, bubble, and outright breaks, and why some doesn't.