somehow I found this (but didn’t see anything related to standing on the seat):

https://en.wikipedia.org/wiki/Toilet-related_injuries_and_deaths

In the past, this number would have been much higher, due to the material from which toilet paper was made. This was shown in a 1935 Northern Tissue advertisement, which depicted splinter-free toilet paper.

New fear unlocked. Good thing I have a bidet now