They’re not particularly popular as far as I can tell, but my point only relies on the concept itself as another example of manufacturers implementing features to attempt to influence how the product can be used.
At least in that case people can (and it seems they have) vote with their wallet, and avoid the more limited "nannying" product. Given the lack of competition in things like mobile phone OSes, that's not always an option.
They’re not particularly popular as far as I can tell, but my point only relies on the concept itself as another example of manufacturers implementing features to attempt to influence how the product can be used.