A lot of modules are out there that are nothing more than the core modules with a little bit of extended functionality.
A lot of skins/containers are out there that are nothing more than the core skins slightly modified.
Most of which are all claimed as a companies "own" creation.
If you want to exhaust your efforts complaining about the morals of some business you have no association with, your free to do so. But you do so at the risk of your financial future as noted previously.
What that company is doing with DNN isn't illegal. What they are doing with the skins could be, but that would be up to the people that created them originally, not you.
There are plenty of web development companies/consultants out there using/selling DNN as there own. I find it quite odd that you come into a public forum and want to single just one out and open yourself up to libel.
My advice to you would be to drop your little e-crusade and focus on your own company. You might even want to market your morality in your next press release and see how far that gets you and your company.