Every time my grandma needs help with her phone I always have to go and delete like 10 apps because she just keeps installing random useless ad ridden crap. She has like 6 diferent weather apps. She keeps installing random fucking gps navigation map apps. You open them and boom immediately ads. They just don't learn.
I've noticed the tech illiterate develope tunnel vision and only see the tiniest portion of the screen at a time. They also are incredibly suseptible to the dark patterns that phones are riddled with so when the phone helpfully tries to offer a random app that paid to be promoted with a certain search term they don't realize they've been had and blindly install it