Luckily, while NPUs do nothing about data exfiltration, they're a poor solution for training models. Your data is still going to get sucked up to the mothership, but offloading training to your machine hopefully won't happen.
I agree with the premise as a Linux user myself, but if you're using any JetBrains products, or Zoom, you're running models on the client-side. I suspect small models will continue to creep into apps. Even Firefox ships ML models in the browser.