Went to a camping in the Laurentians in Québec (Ste-Agathe) and there were those things near some camp sites. The sites are only accessible by footpaths. No car access. And if you bring a bike, you have to walk it up a hill, so I doubt they are bike racks.
I’d assume it’s for wood if there are designated fire areas for each camp. I could see it being even more useful for wet wood, allowing you to set it near the fire to dry out.