You want to restrict applications as much as possible without hindering their function. An assistant is only annoying if it can't actually do anything. If the hardware doesn't follow some cosy deal the user can swap out the API when they like, you would have to compete for real and forever.
Because there is simply no need to.
If there was one significantly better overall than Google (and not just a little better or better in just certain niches) people would switch.
Even if the products are better people don’t switch. Google organic has been a spam cesspool for a while with a few layers on top of ads and people don’t switch. I know some people that use Bing because it is the default of windows and they don’t switch.
I've used bing for a decent while but since they can't make a normal website that works on Firefox their slightly inferior results made me use Google again.
