Probably because Stewart and Colbert don't mind if their shows are available on YouTube. The rumor is that Daily Show and/or Colbert Show interns upload scenes from their show every night, and Viacom lawyers requests that YouTube remove the scenes the next morning.
YouTube Wants to Talk to Jon Stewart - WSJ.com:
Google Inc.'s YouTube unit has requested that comedians Jon Stewart and Stephen Colbert be deposed as part of a copyright dispute with Viacom Inc., according to court filings in the case. In a scheduling order, the video-sharing site lists Mr. Stewart, the host of Comedy Central's “The Daily Show with Jon Stewart,” and Stephen Colbert, host of the network's “The Colbert Report,” among 32 people it wants to interview before trial. Sumner Redstone, Viacom's chairman, also is named. Viacom filed a $1 billion lawsuit against Google and YouTube in March after discussions failed on licensing Viacom content for use on YouTube.
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