There's nothing wrong with it, in fact it's quite clever. I'd have no issues with making it available on Linux, though it would take a decent amount of work.

Beyond that, I'd like it more if it were possible for the user to say "I'm going to override you, OS, and require this app be allowed to run regardless."

Only downside thus far is it makes cross platform software more difficult if you target the iPhone and want to make use of it.