A Prison For Your Plant

Barley, a dog, sniffs at the edge of slightly wild plot of front yard in which a freestanding trellis entirely encases a shrubby plant.
I very much see the appeal of a freestanding trellis, but I’m always a little mystified when I see one being used for something other than acting as the substrate for some sort of vine or ivy. I wonder if maybe this was placed around this plant when it was much smaller and was first planted, in a bid to protect it? And now it has grown large enough that it is the plant that has trapped the trellis, rather than the other way around.