Personally, I agree with the points @kevincharlespels makes. Running an entire city is a sisyphus challenge.
What would occur when a person reaches 100%, a new OSM update comes in that bumps that person from 100% but then the person completes the new changes and gets back to 100%? Would this get them another timestamp? That could mean new timestamps every ~5 weeks (rough time of when new city updates are made).
Would there be disqualifiers to get this timestamp? ie only those with zero streets manually completed? That could create an unfair technology divide. Ex: Runner #1 in a city with large buildings is not able to complete certain streets via GPS recording because GPS wobble caused by buildings; so they mark as manually completed. Runner #2 has a better recording device and is able to get a good enough GPS recording to have the street completed by GPS. Runner #1 completed the street a year before Runner #2. Should Runner #1 not be considered the first to complete the street/city?
Or even more drastic of an example, what if a runner doesn’t have a GPS recording device? They use a paper map during the run and then afterwards mark them as manually complete via website?
P.S. This should likely be merged into this topic as this doesn’t really fit in ‘Support’ category as it would be a new feature; so better in ‘Ideas’ category. In addition that topic already has gotten the ball rolling on thinking out the idea.