You're operating under the assumption that Microsoft is the only one doing this.
This sort of thing happens regularly on Android though it's perhaps more subtle. I don't know how many times I've had to set the default browser, photo viewer, pdf viewer, etc only to be prompted to choose how to open a file and Google's App is first in the list.
Certain features like STT for the entire operating system require Google Assistant. And image search or real-time translation require the Google Search App to be installed. So you have to choose between being harassed by Assistant and Search prompts at ever turn, or disabling core OS features.
This sort of thing happens regularly on Android though it's perhaps more subtle. I don't know how many times I've had to set the default browser, photo viewer, pdf viewer, etc only to be prompted to choose how to open a file and Google's App is first in the list.
They also implement features in their Apps to avoid your defaults: https://i.imgur.com/9nzpTPG.png
Certain features like STT for the entire operating system require Google Assistant. And image search or real-time translation require the Google Search App to be installed. So you have to choose between being harassed by Assistant and Search prompts at ever turn, or disabling core OS features.