You can't just label everything as "doing business" and then regulate it all. If I make something interesting and give everyone in the world the blueprints so they can make one themselves that's not "doing business".
Much as I ardently support FOSS (and similar: open hardware, say) I also think this idea has some use and deserves substantial consideration.
It is difficult to draw the line here, much more difficult than it seems at first, in my personal opinion.
I don't find the idea useful to anyone but the unscrupulous. I find it very easy to draw the line. If I design something and publish it and people find it useful and put it to use that's clearly not commerce, that's just creativity.
MS give away a browser with their OS, that's still business activity but not directly commerce, IMO.