[icedrift]

I don't like that default on mac either but in their defense it's super easy to customize. I turned off all but applications and my documents folder for spotlight search.

[int0x29]

Last I used OSX (the version prior to the current latest IIRC) not all of the "suggestions" could be turned off

[user34283]

It's also easy on Windows:

The kebab button next to the search results takes you to Settings -> Privacy & security -> Search

Switch off Bing.