Most of those use cases are untraceable.
But there's some things you shouldn't pirate. I was a freelance developer for a company. They hired another set of freelancers who used stock photos and music, but didn't have the proper licenses. Had legal papers sent their way.
I learned about it because the company started demanding I provide all the proper licensing of my code and the libs I used. I have no idea what the details are or what happened. But they were pretty freaked out.