Seconded re moderation.

Also, the site itself - the ethos of the owners; I used to have an account, became disenchanted with the mods, decided to delete my content, close the account.

I then discovered;

  1. You cannot delete answers which have been accepted.
  2. The mechanism for deleting your own content allows you to delete a max of something like five replies per day.

I then took the time to look at the T&C, and SO as I remember it simply make all of your work their property.

I deleted everything I could, over the course of a significant number of days, and left.