Hello eerib, 

Secret mountain bike trails should not be added to OpenStreetMap (OSM) due to significant environmental, safety, and community concerns. First, many of these trails are located on sensitive or unauthorized land, which can lead to erosion, habitat destruction, and conflicts with landowners, jeopardizing access for all riders. Secondly, these trails are often unmaintained and unregulated, which can pose serious safety risks to riders unfamiliar with their technical challenges or conditions. Finally, these hidden trails represent the hard work and passion of local trail builders who often have legitimate reasons for keeping them low-profile, such as preserving trail quality or avoiding overcrowding. By respecting their wishes and keeping these trails off OSM, we help maintain the delicate balance between access and sustainability, ensuring that our riding spots remain enjoyable and intact for years to come.