When you install Linux, where is the OS downloaded from? Where do the software packages and updates reside? What about the source code?
If you blocked Microsoft (Azure + github), Google, Amazon (AWS), and Akamai, I'd be surprised if you could run any mainstream flavour of Linux.
Some *BSDs might work.
I minimize my interaction with the big computing-advertising-consumer entities but I know they're still there behind the scenes. It's all part of the same cesspool.