@vienne - If it makes you feel any better, those people that downloaded your book likely didn't cost you money as they probably wouldn't have purchased anyway. Those people typically don't, they only take what they can get for free, so they weren't your market anyway. Just another way of seeing it. I've seen it a lot with digital products. It does still feel bad though.
Usually companies will send a letter first telling people to take certain materials down. I would think that Mike and Kim, who I've never watched, could probably just get rid of the copyrighted content within their videos and remake them, unless of course their videos are dominated by that material. If they didn't beforehand, they should have really done research into what can be used. I know that I wanted to let my interviewees pick a song that they liked for my podcast "shunned" that I'd play at the end but after research I can't even play a clip, even though doing so would actually promote people listening to those songs, maybe even purchasing them.
Ultimately I love that the Watchtower is spending time and energy on this though. I love seeing them waste time and show how much they care about what apostates do.