Hot glue is not actually a glue , it is not actually sticky , it is simply a plastic that turns liquid when hot and has a very low viscosity and surface tension (means the bead spreads out and wets the surface) and it relies on air pressure to hold objects in place , the liquid "glue" excludes air and hardens on cooling keeping air away from the joint, works fine until air eventually seeps into the join or something bends , then it fails .
I wouldn't trust it for supporting anything heavier than a few ounces.