Actually, plenty of activists, for example Cory Doctorow, have spent a significant amount of effort discussing why the DMCA, modern copyright law, DRM, etc. are all anti-consumer and how they encroach on our rights.

It's late so I don't feel like repeating it all here, but I definitely recommend searching for Doctorow's thoughts on the DMCA, DRM and copyright law in general as a good starting point.

But generally, the idea that people are not allowed to freely manipulate and share data that belongs to them is patently absurd and has been a large topic of discussion for decades.

You've probably at least been exposed to how copyright law benefits corporations such as Disney, and private equity, much more than it benefits you or I. And how copyright law has been extended over and over by entities like Disney just so they could prolong their beloved golden geese from entering public domain as long as possible; far, far longer than intended by the original spirit of the copyright act.