>>76621510 (OP)
Its good and bad at the same time. Its good it got people walking. For most people, especially of they are untrained or deconditioned or very sedentary, walking is probably the best exercise they could be doing.
The problem is the mental aspect. It seems to make people obsessive and it seems the counting aspect stops them from learning to simply like going for a walk. It would be better if people would learn to love walking as its own thing, not as a check-list item.
Like walk 30-60 minutes every day. Enjoy simply moving the body and being out in fresh air an sunshine. Use it as an opportunity for quiet reflection, or as a nice social time with friends or family. Its like reading. I think reading has massive mental benefits, but only when a person deeply immerses themselves in a book. When they read as part of a challenge, or daily word count goal, its like it takes them out of the book and makes it a different activity.