There are plenty of examples of hardware being artificially constrained, and low hash rate GPUs are hardly the first. Slippery slope fallacy aside, why would you need a top of the line GPU to do strong encryption? That's something you can do with a pen and paper if you're motivated enough.
I just hacked my 3ds because nintendo is closing the eshop permanently. It uses GPUs to exploit something in the OS based off of known keys. The power needed to crack the code in 1-5 minutes requires powerful GPUs. Are you suggesting if NVIDIA decided to block something like this, I do it with pen and paper?
