Nvidia probably encrypts firmware to protect IP rather than to block Linux users; maintaining open drivers across platforms is expensive, and they’ve historically prioritized Linux for datacenter
edit: even more important for mobile computers
That them trying to protect IP around something very profitable isn't crazy. That not being fully supported in Linux, when the product was literally designed around Windows, also isn't crazy or really evidence of anything, including evil (see the whole fucking history of Linux compatibility of made-for-Windows hardware).
Maybe let them cook.
It obviously can't be because of ulterior motives!