This feature has the benefit of teaching users (correctly) that browsing the internet on a phone has always been a terrible idea.
Which sure, not using your phone is more secure, but good luck convincing users that they shouldn't use any apps or websites on the go.
It's all objectively terrible, and it accomplishes nothing except allowing the user to use the internet right then and there.
Also, I don't get how the situation with your home internet connection changes much. Your ISP knows exactly where you are because your house doesn't move.