I get people in my life to buy ios devices precisely because, even when they try, they are unable to install malware. That is not a feature any other OS has. Particularly the over-easy access to sideloading on android.
Just last month my MIL managed to get her bank account password stolen because she used it on her PC and installed who knows what from one of those fake Microsoft support pop-over ads. The solution is to only access bank accounts on ios.
It's really a major selling point of the devices.