Here's a rather less paranoid article that's (partly) about SO.

http://www.tbray.org/ongoing/When/201x/2012/02/29/Undocument...

Seriously, given that the data is freely available and for as long as it remains so, "OMG you're making money from my knowledge how dare you you cad" is about as valid a complaint as it would be if levelled at any of the ISPs in days of yore that ran Usenet servers. And it's definitely saved me more time (a factor of 100 - 10,000? I have no idea) than I've ever given back to it