I think it would be interesting to see a milestone mileage badge by a rider's name or profile, simlar/adjacent to the Premium badge. It would be cumulative versus annual, and maybe in intervals of 25,000 miles (or KMs)... or at least large enough to be interesting and not updating all the time. (10,000 KMs might be too small/frequent to be meaningful.)
This is on my mind because I'll cross 100,000 miles late February or March, weather permitting. I'm kinda proud of it!