The official reason was along the lines of "I don't want to host another Project Chanology," but it probably had more to do with the fact that moot was closely involved with at least one Gawker Media employee[1] and spoke at XOXO[2] alongside numerous companies and organizations that the Gamergate movement is adversarial towards.
EDIT: Downvote all you like. I'm not making any judgement pro or anti Gamergate in this post, I'm just pointing out a rather large conflict of interest.
[1] https://www.reddit.com/r/KotakuInAction/comments/2gvtrp/
[2] http://knowyourmeme.com/photos/833450-gamergate
EDIT: Downvote all you like. I'm not making any judgement pro or anti Gamergate in this post, I'm just pointing out a rather large conflict of interest.