It's possible that spending time on those 1500 extra steps might help. However, it takes a decent chunk of time to walk 1500 steps, and there are so many forms of exercise you could do in that same time that might be far more valuable for your health... and a lot of them actually could be a lot more fun for most people if they take some effort to discover them.

I worry that these tools perform a sort of psychological trick on people that resembles a "denial of service attack", fooling them into thinking they are using their time wisely by just walking around more, even if the benefits are negligible & leading them to avoid exploring other options.