I'm not sure how you're getting that from their post? None of the four things mentioned (book publishing, web publishing, open-source software, computer hardware) involve stealing someone's property, he's saying that the ability to produce those things widened and the cost went down massively, so more people were able to gain access to them. Nobody stole your bike, but the bike patents expired and a bunch of bike factories popped up, so now everyone can get a cheap bike.