This is because everything was moved to the web and users were beaten over the head with a hammer to never install anything on their computers. The sky was falling and subsequently the desktop software platform hardly exists today.
No data breaches occur to insecure passwords
Phishing, let alone spear phishing isn’t a thing
No popular app has ever found to be doing naughty things
We’ll not to the oss crowd anyway, if it does happen, it’s coz they aren’t using open source and checking every line of code
Google and Apple want to control their users, they don't want to give you an open phone. Instead have a look at Librem 5 and Pinephone, which run GNU/Linux.
Apple realised that far more than google imho
And myself being an apple guy with a dev account, i can install pretty much what i want