Don't believe that would it be considering I've partnered fresh channels that have all optionsI'm not so sure that it has anything to do with the network. I am more inclined to believe that one channel has better permissions based on performance.
...I've partnered fresh channels that have all options
Not true. I have this ad option on every video (even 21 seconds) on another network (however, I believe prerolls only actually show up if the video is over 30 seconds). It is not on any videos at CN.The additional ad format is only for videos which are long enough. I'm not sure on what that actual minimum length is, for videos to show those types of ads, it must be at least [3] minutes long.