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It's only the tiles visited by people who have:-
- Joined the RideEveryTile Strava group
- Marked their activities as public
- Done so before the most recent data grab
So there will be plenty of tiles that have been visited hundreds/thousands of times but they're just not being grabbed by the scripts that suck the data from Strava.
There were a few that I knew I'd visited that weren't showing up and, after making the appropriate changes they eventually showed up.
Looking at the website (bottom left) the last data grab was on 15th May so it's not exactly done frequently let alone automatically.
- Joined the RideEveryTile Strava group
Do you know how https://rideeverytile.com/tiles/heatmap collects their data? there is at least one tile (edit: several) that is marked as "no visitors" when I certainly have... several times.
All of them around Wanlockhead in the Southern uplands.