I mentioned in some other threads. It is not about undesirable
content. Holding a prized statue n fully clothed is
undesirable?
Anyways...
By hotlinking from the original website, you are technically using
their bandwidth. That is money. And I dun think you know too that
if they bother to check why bandwidth was exceeded on their
side.... with technical knowledge, they can trace to the source.
And when they do, who will they PM to?
Sure, the image may not be of their original photo shoot but it is
still unethical to steal their bandwidth.