We're working on adding more networks to our service. There's no ETA on when Nickelodeon and Hallmark will be added. But, you can fill out the request form with the channels you'd like to see: https://goo.gl/RxavdA . It'll help our team prioritize your request.
@YouTubeTV @TeamYouTube y u no hav Nickelodeon or Hallmark. Make me very sad 
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