"can EVER" would be the key as it speaks to possibilities in the future.
"asking 'May I install this app please?'" did not apply to your example in the sense that you would had to have specifically sought out the app.
"and allowing the user click 'Yes'" must be followed by a password.
Oh sorry. I didn't realize we were going to split hairs. Nahhhhh just kidding BaldiMac - totally knew you were going to!
Whether it's the same exact scenario or not - the simple fact is (and something some are in denial about) is that operating systems are vulnerable - no matter who makes them.