> Maybe grandpas and grandmas should get a different phone then, like a Doro
They did, they got an iPhone.
> my mother has been scammed by legitimate App Store apps that have charged extra-fees just because they could.
Did it empty her bank balance by abusing the private NFC payment APIs that Apple are being ordered to open up?
Did it cryptolock all her files?
Did it activate the camera and mic to spy on her for blackmail?
These are things that we need to worry about with random things we download on desktop these days. It's not 2007 any more, I have an entire spare computer for untrusted software.