I actually agree that it’s an issue amongst controlling partners (of both sexes). I’m not so sure you can totally blame it on parental behaviour though.
For the kids I know who are late teens now it is completely normal to share location with their friends all the time and has been since they first got smart phones. They all
have location switched on on Snapchat and just use it routinely- just yesterday my son checked his friend’s location before going out to meet him, saw he hadn’t left his house yet and put off going out by 10minutes. I think they also have their closer friends and certainly girlfriends / boyfriends on Find my iPhone too.
I think having a chat about how it should’t be used in a controlling manner is really important (both not to do it and not to accept it being done to you) but if my son’s friends are typical I suspect we’re now well past the point of routine location sharing being the norm amongst young people.
It's parents that teach their children what is acceptable.
For example none of my older kids (20, 22 & 25) share their location with anyone - even friends. None have ever used snapmaps. Neither have the majority of their friends.
However, one of the local HT's is married to a chap who worked for CEOPS. Every year he does a chat with parents whose children are just about to go up to high school. It's a very blunt meeting where he explains how apps work, where the risks are, how they are used by those looking to use them for nefarious purposes and how parental controls can be got around.
It's a very sobering meeting. I think it's no coincidence that kids round here seem far less likely to use tracking apps and snapmaps than where my BiL lives for example (my niece did use snapmaps for a while but doesn't now).
The fact that I don't track DH, he doesn't track me, that their besties parents don't encourage tracking etc, along with chats about it, certainly plays a part in the reason that it's not common among the kids.
It's important, imo, to emphasis to kids that it should not be the norm. If you want to do it then fine, but it shouldn't be something that's switched on and forgotten about. It should be considered and reviewed. And it should never be automatic.
It also encourages a lack of manners imo, but that's a lesser issue than the safety aspect. If you're going to be late you should be letting people know, not expecting them to track you and adjust accordingly.