Re: Love the article
If you only run a relay node (not an exit node) the chance of getting a knock at your door is pretty much zero. It has never happened as far as I'm aware. (Obviously I'm assuming you don't live in China, that wouldn't be a a different situation.)
You do risk getting blocked from certain websites though, since apparently they can't be bothered to distinguish between exit and relay nodes despite the Tor Project publishing a list of which is which.