Hmm, I've known several Apple users who have experienced the same thing. Both with branded Apple cables and third party ones. I seemed to notice lighting users having more dead cables than USB-C users seemed to, and it seems to me that lightning cables more frequently omit robust strain relief for aesthetic reasons.
The most frequent tendency I notice among people who have their cables fray is they use their phones while charging, but if you do certain things on your phone like long gaming sessions, you are almost forced to use your phone while it charges. So blaming the user feels a little bit like "you're holding it wrong" to me.
Where I did notice a difference between USB-C and lightning is that the lightning PORT seemed more durable than USB-C ports. I own multiple phones with flaky USB-C ports, whereas lighting ports seem much more durable.
The most frequent tendency I notice among people who have their cables fray is they use their phones while charging, but if you do certain things on your phone like long gaming sessions, you are almost forced to use your phone while it charges. So blaming the user feels a little bit like "you're holding it wrong" to me.
Where I did notice a difference between USB-C and lightning is that the lightning PORT seemed more durable than USB-C ports. I own multiple phones with flaky USB-C ports, whereas lighting ports seem much more durable.