Comment Re:Other app store (Score 4, Interesting) 229
So why not use a different app store then?
Exactly, there are plenty of ways to get software on a Mac.
Mac App Store is one, and it's required if you want to use iCloud (for security reasons - detailed below).
But there's also Valve's Steam (a good way for games), and you can always roll your own web store - it doesn't take much to accept Paypal or if you are a business, to get Amazon Payments or Google Wallet.
A lot of developers that started with iOS migrated to the MAS when they port their IOS apps to OS X - you find a lot iOS games "enhanced" for the Mac. Cross-platform games usually are on Steam, and there are few on both. Steam is nice, though it limits you to one user at a time, while MAS lets you have 5 copies on 5 different PCs at once. Useful if you want a quick multiplayer without having to have 5 copies (especially in a family setting).
Regarding MAS and iCloud, well, you have to hark back to the bad old days of Microsoft office viruses - they'd infect Microsoft office's default template files and then subsequently infect every document since then. Well, you can imagine one using a variety of exploits that infect an entire computer. Use something like iCloud and now the attack's persistent - you reformat the computer, reinstall the app, and boom, you're infected again (thanks cloud!). So Apple made sandboxing a requirement for the MAS, and use that with iCloud mean well, if that happens, damage is limited to within the sandbox. So you're isolating the rest of the computer from the infection target (since the sandbox keeps the infection to a small area) in case a persistent piece of malware tries to remain in that way.
Without sandboxing, a cloud storage account could prove very interesting. I'm actually surprised we're not seeing viruses try to persist using Windows Explorer vulnerabilities and say, DropBox. (Remember the ones involving specially constructed image files? Imaging putting one of those in DropBox, and now when you browse to it, your PC gets infected. And the virus makes sure to keep a compromised image there so even if you wipe and reinstall, you install dropbox and boom, infected again.)