Our Terms of Service prohibit running a server. However,
  use of applications such as multi-player gaming,
  video-conferencing, home security and others which may
  include server capabilities but are being used for legal
  and non-commercial purposes are acceptable and   
  encouraged.

WTF? Our terms of use prohibit using a server, but some server uses, of which we will provide you with some examples but not definitions, are actually (contrary to what our TOS say) both allowed and actually encouraged.

So, thanks for telling us that your TOS doesn't actually mean what it says, but no thanks for not actually telling us what it does mean.