An arms race of the update whack-a-mole as the encrypted blob grows and encompasses more...
Example: Where is Newtonsoft's Physics Library v1.x? It was awesome, easy, fast, and worked with my engine (or rather, my engine worked with it?). Gone. Nowhere to be found, not even on the internet archives way-back-machine.
It's rather trivial for a juggernaut like NVidia to wipe the earth of older cuda compilers by tweaking a driver and making cuda compilation cloud-based.