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.

it is more like:

You gatekeep your bike, you keep it behind a gate, you don't let anyone else ride it.

Your neighbor got a nicer bike for Christmas, rode it by your house and now you are sad because you aren't the special kid with the bike any more, you are just regular kid like your neighbor.

Using physical analogs for virtual things is not the best choice, for example: Would you give a copy of your bike, or copy of your food to your poor neighbor kid if you could copy it as easily and as cheaply as digital products?

Actually he would be very wise, for he then has a bike and can ride it or sell it for money. You have to learn capitalist thinking to succeed in this economy.