Modify this to fit your TOS. Generally speaking you want to let users know what you are reliable for and what you aren't. For example if Valve shuts down your site for some reason, you shouldn't claim responsibility for the skins on the bot. Also, if somebody fails to get their skins from the bot in a week you shouldn't keep them on the bot forever. Or if someone gets VAC/Trade banned and can't claim their skins, you shouldn't give it to their other account. Be strict, come up with some good policies regarding your premium membership aswell!
There's plenty of space here as you can see!