First off, I didn't downvote you.
However, the comparison is wrong imho because disk storage is not simply about storing information. Disks also need fast read/write access, which DNA certainly doesn't have for us (for now?).
That's very interesting because with increasingly lower limits this argumentation becomes less convincing.
I can imagine many people using up their 500MB with their smartphones in the near future, if they don't already.
I think you may have misread something there. The link clearly says:
"Specifically, we are supporting the WebM (VP8) and Theora video codecs, and will consider adding support for other high-quality open codecs in the future. "
It's the same as with any uprising really. You can't expect people to follow laws when they are made by the "enemy".
That so many people are willing to break the law when taking action shows how important the issue is to them. It also suggests that there is no other effective way to take action.