The gr are pretty well maintained and that takes energy. So the analogy is lacking a bit here, even though I think that this seems somewhat backward and there should be a better solution.

Italians don’t have this issue with OSM , yet trails are very well maintained.

> That’s so weird, I wonder how that works. If I’m the first to make a map or a street or any geographic object in France, it can’t be featured on any other map, unless so license it?

A GR isn't a geographic object, it is a sequence of trails that has been arbitrarily chosen by the author among all the possible sequences of trails.