2) Spiteful peers with "dog in the manger" mentality.
The latter case personally irks me, mostly because this often involves personal benefit (economical or moral) due to them claiming to give away knowledge for altruistic reasons, which later behavior reveals was a lie, mislabeling proprietary as open and free, to reap unfair gains.
1) Lazy peers, and
2) Spiteful peers with "dog in the manger" mentality.
The latter case personally irks me, mostly because this often involves personal benefit (economical or moral) due to them claiming to give away knowledge for altruistic reasons, which later behavior reveals was a lie, mislabeling proprietary as open and free, to reap unfair gains.
But that's all off-topic for this thread anyway.