It's a good idea to create a more decentralized solution to share your parkour spots.
Unfortunately osm.org does not support custom POI lists.
The german OSM community is hosting a Umap service, where you could create a custom POI map. (https://umap.openstreetmap.de/en/)
The map can then be shared and the POIs can be downloaded as gpx, kml or similar file. This file can then be imported into any Map Apps.
For the photos.. If you get the permission to put these under a Creative Commons License, then you can upload them to Wikimedia. Then put the link into the description of the POIs in the Umap