You have to appreciate Terry Cross' ingenuity and recognition of the ability to use this hardware to make the Harris more functional, but he didn't invent the hardware, he simply figured out how to adapt it to fit his needs, in this case tensioning the cant adjustment on the back of the bipod.
Adjustable levers are nothing new, and I've used many of them personally in other industry for years. I hadn't seen the newest iteration (the unitized kit) until this thread. Good for him for creating a product he can sell, but unless he has the ability to patent the procedure and use of already widely used hardware for this specific application, I'm not seeing how anyone can get pissed at other manufacturers. I don't think you can patent widely available hardware based on using it for the same application, just a different industry.
Maybe people on this site haven't even encountered these levers, but they're very common and have been used in various industries for many many years. Terry Cross did not invent the adjustable lever. He has done a great job in using them in an application that benefits us all, and he has done a good job with the evolution of the product, however I'm not sure there's anything here he can patent and defend, and I'm not sure you can blame another manufacturer for simply using the same existing technology and branding it for the same purpose.