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.
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.