Yeah how did they get your ip from a reddit post? Unless you typed it out yourself.
He probably posted screenshots and nicehash traced his account by those means.
There are other options available such as honeyminer & winminer which revamped their gui.
For those who use these easier mining programs.
I have one problematic motherboard which doesn't behave well in Nicehash so I put that only one board to work with Winminer for the colleagues which I manage about 20 rigs. It is working much more stable with Winminer but at a hefty price to pay, the profit from Winminer is almost 50% less than Nicehash.
With Nicehash I am making about 5 dollars with a 6 cards rig while with Winminer I am making near 3 dollars daily. Good thing is that only this board is problematic as it is not a mining specific board like Asrock or Biostar but just a MSI Z270 Pro.