It’s all about risk tolerance. It was thought that improved brakes on cars would hugely improve safety. However it had a much smaller affect as people just braked later… There is a level of acceptable risk that everyone has, increasing safety measures just means they take more risks up to that level.
Helmets make people feel safer so they do more risky things and therefore hurt themselves more in other ways.
Doesn’t mean you shouldn’t wear one though!
I guess this kinda counts: https://wandrer.earth
It gives you points for every unique mile you walk/run/cycle etc with the idea of getting you to go to new places and explore. You then get bonus points for doing 10/25/50% etc of an area.
Works off Strava data, so you would have to actually record the walking. But I found it was great at getting me to go to new places.