They care about protecting their own content and using the law to do so where possible - you can not logically infer from that fact that they care about copyright or the law more generally.

The WB & MPAA marketing message is that they care about the law generally, and creativity generally.

Are there alternative means of protecting your content?

No.

I was questioning the assumption that because they use the law this way they are necessarily bothered one way or the other about the laws and regulations as they apply in contexts other than this one.