I stopped using apps like this because they were always getting broken by youtube. Obviously it's intentional sabotage but still. It felt like I had to update those apps every time I used them and sometimes there was no update at that time at all. The mobile site never breaks and you have full access to extensions if you use firefox.
When something is available for every channel to rerun, it would be even less of a differentiator than a channel getting the rights to Friends or Seinfield today.
So Channels wanting to attract people would need to come out with new material still - as Seinfeld and Friends would be able to be played by any other channel.