Big Assumptions on your part. Do you think 'grandparents' also don't use iphones and androids? If anything more people are more familiar with this interface than Windows/Mac WIMP.
Anyway, their Windows laptop got all sorts of shit "side-loaded" (and I have a benign theory about this happened), and put them on iPad like 15 years ago. You can object to the closed system, but zero tech support calls for me.