Because, realistically, given choice upfront most will probably choose to disable it even though they won't mind it if its there. When installing an OS I don't

Because, realistically, given choice upfront most will probably choose to disable it even though they won't mind it if its there. When installing an OS I don't want many questions. I just want to get on with it. Ask me a question and you won't get my full attention and given the option to disable something I might just disable it. Maybe a compromise is a notice while installing that the default is to search with Amazon and instructions on how to disable it. Those who really mind it can find their way there after the OS is installed.