By default, Android devices are locked down in 2 ways - you've not got root, and you can't install unsigned non-market apps (though trust of market apps is some

By default, Android devices are locked down in 2 ways - you've not got root, and you can't install unsigned non-market apps (though trust of market apps is somewhat of a joke). You can obviously gain root, and you can easily tick the box to allow unknown sources, but it seems likely that 99% of Android consumers are not going to do this without a decent reason.