Typically you'd record your run with GPS, no need for cell service, sync it to your devices occasionally and that's when it might be uploaded, or later.
Such social sharing + gamification systems are no different than Github contribution streak or StackOverflow awards for streaks etc. Those streak award only benefited the platform, while awarding us fake points and badges, the fitness streak rewards and social sharing benefits the users health so arguably has a stronger case for being gamified.
We can argue all day that people should want to do fitness to be healthy, not on how they look or other people see them or their fitness, but reality is that the social component of fitness is a big part for many people be it at the gym or in an app.
Imagine this data going to a burglar, who has a digital dashboard of nearby one-person properties and when the owner is likely to be out, able to act with confidence they can leave before the victim could return.
Sure, sophisticated international hitmen won't have any interest in catching you in ambush... but that doesn't make you safe from a local rapist of opportunity.
In Western Europe there are also foreign burglar gangs that go on sprees for a few weeks. They're well organised but don't have time to do the stalking. They use publicly available data as much as they can.
Most of us, but for those that are...
However, in the world we live in today, the various LEOs are using this type of data to find people they do not like. It's getting to the point that I pine for the days of good ol' 1985 where you could just be another anonymous person in public with no tracking of your every move.
a) Analysis and tracking of your own personal goals. (Some of the tools are better than the stuff available on the device itself.)
b) Sharing and socialising some other activities.
You can be careful and only allow certain activities to be public but you'll make mistakes and eventually many people will just think "whatever, I'll just default to public and remember to hide the ones I don't want to be public" and then it's even easier to make mistakes.
Defaulting to "opt-in" is all well and good until a human makes a mistake.
Here's a few examples that might help demonstrate my point:
I used to do parkrun regularly. I had no problem sharing my Strava activities for parkrun because me doing it wasn't a secret, nor was the location secret, nor was my time secret. All of these things could be found from the parkrun website once the results had come up. John Doe was at this location at 9am and ran this route with 400 others in a time of 26 minutes or whatever.
I was also part of a cycling club that did a regular "club run" on a Sunday. 5-15 of us all doing the same route. It was good for club morale for us all to upload our rides to help show how popular it was and encourage other club members to come along. They could see that we weren't going at a silly pace and that we stopped regularly to regroup as we had riders of all abilities and speeds riding with us.
But then I also helped out with my kids running club at school, taking a bunch of 7-11 year old's on a 20 minute jog/run (depending on how quick they were) around the local area. This absolutely should not appear on Strava (public or not). The running club wasn't a secret (everyone at the school knew since they had the option of letting their kid do it) but that's a whole world of difference from having it public on Strava showing the usual start time, the various routes we used to take, where we stopped, etc. Privacy zones can help hide the start/end but that wouldn't help hide everything.
We just made sure that all of the parents who helped out knew that we shouldn't even record it with their smartwatch. I just used to create a manual entry of "Morning run" with approximate distance and time. That was good enough for my training stats.
There's no one privacy setting that handles all of this. Whatever setting you use relies on me to manually adjust the activities that don't fit that setting. The problem is that humans are fallible, so remembering to make it private or hide the location data isn't entirely reliable. You're also at the mercy of Strava (or whatever) not doing something stupid and accidentally making private data visible due to some bug, glitch or leak.
But at least that's a failure you can fix once you notice, as opposed to making something public that shouldn't have been. Letting people opt in to automatically sharing runs to the public just seems like something designed to get people to share stuff without thinking about it.
Maybe "automatically share everything to the globe" should just not be an option for sensitive data like this.
Which is weird, because if they bought a Garmin device, they already have all that built in.
The social stuff is nice though.
Genuinely weird to make statements like "they already have all that built in" if you don't even know what Strava provides, don't you think?
I have the family exercise group on mute, lol