What is this thing in the ATL bathroom stall? There's already a hook on the door...?

It has a good bit of resistance to it but it can move in a y\x axis. It barely supported my purse.... Any ideas? The hook on the door is entirely stationary and doesn't move at all like this other one ¯⁠\⁠_⁠(⁠ ͡⁠°_ʖ⁠ ͡⁠°⁠)⁠_⁠/⁠¯ I'm stumped