Some of us have this bizarre wish to support the companies and people who produce things we enjoy even if they sometimes make it difficult.
You might expect some people to take an extremely principled stance but it would be unreasonable to expect the majority of society to do so when the companies themselves are operating as unprincipled entities.
There's plenty of good media out there to support without stealing. I'd rather grab an eBook from the library (they get paid) or buy a random indie album on Bandcamp than spend time on media published by people who don't respect their customers.
Many of these companies, and Disney especially,have done their best to prevent works from falling into the public domain when they make a lot of money off of deriviations of public domain works