Apple is just Stockholm Syndrome at scale. I wouldn't trust anything they say about privacy, especially given how closed their ecosystem and hardware is.
TBH, Nvidia kinda deserves this. Between the incredibly buggy forcedeth ethernet chipset, the 2010 era laptop GPUs with insane failure rates that caused a recall across the entire industry, and various other issues, Apple (and others) have legitimate reasons to avoid working with them.
Both of those issues are over 2 decades old. It's the equivalent of boycotting Apple for supporting IBM, you will not achieve anything since the "problem" is already fixed. I don't know how you can call that legitimate in good faith.
Apple had the opportunity to take Apple Silicon to the datacenter and become the #1 professional ARM microarchitecture in the world. It was Apple's stupid grudge that gave Nvidia everything they needed to sell thousands of their lazily-made Grace CPU.