Not at all. This is a good proxy for the activities of wealthy people who don't care about privacy. I'd be interested in this map if I wanted to know where to put up ads for overpriced energy bars. But this isn't a map of physical activity.
The title was changed after I posted my rant. Previously it used a term like population or people (can't remember) including everyone which was stupid.
This is actually a great point about a highly targeted physical marketing opportunity.
I recently saw a small sign nailed to a tree on one of the thousands of back roads in the area that basically turn into a parking lot during rush hour.
I'm sure you would catch some flak for spamming on nature trails but normal streets are less offensive.
to be fair, strava has a free app option, nearly everyone has a smartphone these days (not just the wealthy), and running is pretty much one of the cheapest sports/pastimes/activities one can do.
[edit] I guess the items highlighted in the blog post probably require some coin...