I love how Google casually shifts the blame to the device manufacturers to avoid any flak.
Don't make it on by default unless you make it blatantly clear to the user - because nobody really cares about phone updates, they'll just do it and won't look at patch notes.
If you're adding features that will potentially put a strain on emergency services, you better make sure that you let your users know as soon as the feature is added and give them the ability to turn it on or off then and there.
I've accidentally triggered this before, but was able to stop it from calling 911 thankfully. Now the feature is turned off.