Great suggestion and alert. The internet becomes more and more complicated each day, and there are always people that will take advantage of such a situation where there is lots and lots of information, photos, illustrations, and more. That does not mean it is all “yours” for the taking.
Think of it this way, if it was your work that showed up on someone else’s advertising, how would you feel? I guess it would depend on whether or not you had agreed to it, and hopefully, reimbursed for your vision and your work. Pay attention to that last four words in the previous statement…”your vision and your work”. It means a lot.
If we all took part in what is outright theft, it would be extremely difficult to earn a living, so unless you are giving your creativity away, I think you will know exactly what we’re talking about here. It literally comes down to the Golden Rule.