There are quite a few different apps that you can use to log your travel.
And there are logs generated by your activity on different vendors as well (e.g. BA records and shows all your countries and miles).
That's not really the same thing as badges on a general social media platform IMO.
As others have mentioned the ability to link to your detailed travel profile already exists on FT (if you wish to expose it to others) via your home page etc.
I think the FT badges are deliberately meant to be a lot more lightweight.