Basically, if you don't know/not sure of what you're trying to do, don't do it.
Same advice I keep putting out for Android-based phones, as well.
ANY OS is vulnerable if certain default settings (in there to protect the system) are modified/disabled.
Common sense. Also common sense to stop bashing one OS as not being inherently as secure as another. Only difference is, users of Android are more prone to experiment with their devices, while iOS users are a more complacent bunch.
"But that's nothing compared to the ever-evolving assortment of security threats Android users have to deal with: premium-SMS hijackers, keyloggers, banking Trojans, botnets and other forms of malware that until recently were seen only on Windows PCs."
That just sounds like Android is bad. Which its not. I haven't heard of any SMS hackers, keyloggers, banking Trojans or whatnot that apply for here in the US or in western Europe. The bank Trojan that I know of was for Korean banks. Its all in asian countries and whatnot. I don't think in the years that Google play (or the android market) has been running that there has been any malicious content. Yes there has been plenty of adware. But nothing appeared to be malicious. Android is quite secure as long as you aren't an idiot.
The control grants them extra revenue which they will not release themselves of. If you were to develop a new game for mobile devices with Android you could list it on several market places even sell if directly from your own website if you so desired. This means that Google may never see any portion of the profits of your app other than Google Play sales.
What Apple does is anti-consumer and anti-competition but profitable. Your app every time it sells they will profit. The popularity of their devices shows that the majority of consumers simply do not mind this restriction enough to seek out another product. The only thing that is going to change this is if consumer outlook changes and starts to heavily sway and only purchasing the competitions products for this very reason.
Morally you are right, but in a business point of view. If you a Apple executive or a stock holder this change would hurt you and we can't expect them to damage their profits for a minority opinion.
A friend of mine who got an iPhone as a gift said from personal experience that the only way to really use the iPhone as smartphone was to jailbreak it. That's why Apple ecosystem deserved the name 'Jail'.