[c0nsumer]

It's often as simple as mis-tagging. I do a lot of mapping of mountain bike trails (think narrow, hiking-type trails which are also open to bikes) and these are designated as paths (highway=path), open to cycles (bicycle=yes or bicycle=designated) and some mountain biking-specific tags.

What'll often happen is a well-meaning person will come by, often using an editor that doesn't differentiate between types of bicycling, and change the route to be tagged highway=cycleway. This is the tag for things like paved bike paths, such as urban cycling infrastructure.

The result is now these mountain bike trails, narrow/rocky/tight/steep stuff, shows up in tools that offer bike commuters directions. Just... not great.

So many of us keep an eye on the stuff in our area to see that the tags stay as they should.