Bandwidth is free, as long as it doesn’t get to the point its tanking my performance I don’t care. If people do start to abuse it I will bother to change it but until then no reason to bother. Obviously not giving the URL out here because then immediately it is going to get hammered.

Security through obscurity is fine when the only thing you are securing against is a bit of an inconvenience and the benefit is its easy to give friends a URL to go to. But sure, if it became a problem I would probably look into something else.