The mapping costs for the site ends up being a deciding factor. It goes something like:
Free site with small number of users falls into the free tier for map tile requests.
Site gets popular.
Starts to reach limit for free tier for tile requests.
Next tier costs money.
Site owner is forced to charge individual users or eat considerable mapping costs.
...
Individuals see £10 for Veloviewer as better value as it is a more complete site.
The mapping costs for the site ends up being a deciding factor. It goes something like:
Free site with small number of users falls into the free tier for map tile requests.
Site gets popular.
Starts to reach limit for free tier for tile requests.
Next tier costs money.
Site owner is forced to charge individual users or eat considerable mapping costs.
...
Individuals see £10 for Veloviewer as better value as it is a more complete site.