A lot of the free content on the Internet is stolen, as in the person distributing it doesn't have the right to.
It's not their image, but they host it anyway and sometimes profit with advertisements.

Maybe some people don't care but I worked for a software company that closed down because we weren't profitable enough, I lost my job, then I found our product was being shared on all kinds of torrents and employed people were financially benefiting by using it when they hadn't paid for it, while I was unemployed.

Completely changed my outlook on intellectual property theft.

If it's good enough to fap to, it's good enough to pay for.