Disagree with numbers being the primary reason Apple products are more secure.
Microsoft and Android are both at a disadvantage due to having to support much more hardware, has little control over the software that goes on their devices, and with Windows, has to support many legacy applications and programs.
Apple, on the other hand, is much more aggressive and has much more control over both the hardware and the software that gets to their devices. Hell, I’ve been reconsidering my devotion to Apple because they are even dictating to their customers what you will or will not use. And they are not hesitant to abandon either hardware or software.
That said, hacking individual devices has less of a payoff compared to hacking services.
The number of users is really a kind of incentive for virus developers to focus on a platform. The goal is to have maximum impact.
But I do agree that hacking services definitely has more payoff attached to it, but often the route to a secure system is one of the weak links in the network and most of the times that’s personal computers with access permission connected to the secure system rather than the mainframe that’s running alternative secure encryption algorithms all the time, not to forget the constant monitoring that generally is employed in any such secure systems.