Which company? You can run an unsigned .app on Mac with a ctrl+click, and there's also a system flag to change the block to a click-through popup. Apple is generally good at providing hidden flags to permanently turn off nanny mode, with a few exceptions (the context menu translation feature will happily tell you that a language isn't supported instead of letting you use Google Translate).
>>post-i+(OP)
I think maybe they are referring to iOS, where you can't install any software not on the app store, and all non-safari browsers are required to use webviews instead of their own engine.