Controversial take, I don’t think mods need to be paid. You don’t have to be a mod, you’re actively choosing to be a moderator. If you aren’t getting paid for your work and dislike that, then don’t do it. There’s always going to be someone willing to do it for free, like a hobby.
Sports but not specifically walking, I use FitNotes. I mostly use it to track my weightlifting progress but it does have the ability to track time so I do track my cardio on the same app.
It has Google Drive backups too which is nice