Because I'm the one reading it.

I don't care if they think I should read it in a couch or a hammock or a bathtub, why should I care whether they think I should print it on a page or project it on my ceiling or peer at it through a cloud of malware?

There are people who want to turn the world into a skinner box. I'm not going to fund their project just because I appreciate an author who has made a deal with them at some point.

If I can't pay an author without also paying my enemies, then I'm not going to pay the author. But I'd really rather pay the author.