You should do your research on how wake words work. They literally are only capable of identifying the selected words and they do an obscene amount of training to do so efficiently, because actually processing all the audio your phone is exposed to can’t possibly be done in a reasonable way.
Because freedom.
Windows is one OS, with limited ability to customize. Mac is one OS, with limited ability to customize.
Linux, as a core concept, is hundreds of OSes that anyone can customize any of, at will, to meet their requirements. Different versions of Linux diverge because different people/projects want different things.