According to [this forum][1]:

> Those four maps have been removed because of spawn killing, not spawn trapping. There's a big difference. Spawn killing is literally killing people the second they spawn giving them no chance to move or even fight back. Spawn trapping still gives the team a chance to fight out of their spawn. 

>Those 4 maps had the most obvious spawns in Demo, thats why they were removed.


  [1]: http://www.codvs.com/exactly-what-maps-have-been-removed-from-demolition-t316408.html