If you want to browse the forum peacefully, an old Linux PC is ideal.
Maybe, but we are talking about attack on privacy in this topic, and I don't think old Linux PC in enough for that.
And the way we are going in the world I suspect it is going to get much worse in future, before it gets better.
open hardware is also a good solution
There is a website tracking all open hardware, and some hardware wallets released everything in public, so you can create your own DIY version if you want.