The proper analogy is "SpaceX wants to go to Mars, and is pushing aggressively to do so" while a "Competitor sees SpaceX's cost cutting for LEO, and is aggressively copying that feature while completlely ignoring Mars"
In this case, Tesla is shooting for Mars (Complete autonomy in all situations) and is rolling out each phase.
GM, on the other hand, noticed that Tesla's phase 1 autonomy was marketable, so they copy pasted a profitable feature without copying the overall goal of getting to mars (of making an autonomous car).
Every single GE car with this feature will have THIS feature and nothing else.
Every single new Tesla will have todays features, AND tomorrows features, through software updates, because Tesla is attempting to achieve FAR FAR MORE than GM, and is willing to backport those enhancements.
Today GM looks better. In five years, it might look archaic.