There are some working on making open source processors. These being fabricated in a similar way to modern silicon dies.

But also: https://www.youtube.com/watch?v=_eo8l7HP-9U

You can make your own processor, it might just be a little (!) less powerful than what you’re used to.

I know the point is PRIVACY, but I believe if we put effort toward it, these obstacles can be overcome. Then we can move closer to full privacy on our computers/phones.