The problem with your argument is that the GPL has not only provided the corporate world with free labor, but with a licensing model that big corporations now like for their own stuff, because it lets them license the code to other parties while retaining important advantages over those parties.
GNU and Linux are the engine that powers practically every form of online harm.
The best licenses are BSD and MIT and others of that sort; they have no naive pretense of not helping corporations: everyone can do almost whatever they want, be they a large business or an individual. These licenses also don't encourage unlevel playing fields where the copyright proprietor enjoys dominance in the ecosystem.
For instance, if you are licensee under the BSD2, the only thing you cannot do, in comparison with the copyright holder, is remove copyright notices from the documentation or other materials accompanying the compiled code. This is really a minor thing which only stands in the way of those who want to be outright plagiarists.
With the GPL, it's extremely important to be the copyright holder, so that you can litigate. That's why the Free Software Foundation and GNU Project require copyright assignment for all non-trivial contributions to every project. If your program is a patchwork of files, each copyright someone else, you can't litigate infringement cases easily.