Which one are you more likely to do, install a random app on your phone from an untrusted author or your computer?

In my case none or both, depending on the need. The point is, you could allow lower security if people need it and it's not necessarily that catastrophic as the author suggests.

Why are people acting as if three decades of malware, ransomware, and toolbars haven’t happened on PCs?

Recalling the days of Bonzi Buddy, I don't think the average consumer is more or less likely to do it on either platform.

Isn’t that the point? Bonzi Buddy could do a lot less damage on an iPhone than a computer and when you delete it, you can be sure that it didn’t leave anything behind.

And it’s not just BonziBuddy.

Even Zoom left a backdoor on Macs after you uninstalled it.