I disagree with the characterization of all this media as "culture." They're entertainment products that exist for the sole purpose of generating a profit.
But yeah, the stuff produced by copyright mafia/Big Entertainment/Hollywood/whatever is far, far from the only culture that exists.
A lot of culture is happening on DRM-free places like YouTube, Vimeo, SoundCloud, Bandcamp, DeviantART, Tumblr, itch.io, etc.
Especially YouTube. It's huge. And it's full of people who download other videos and remix them in interesting ways.