This channel was highlighted on Last Week Tonight's recent episode on sports. The gist is a completely serious league where they build elaborate courses and have marbles race on them. The marbles have teams, and the whole thing is sponsored and has completely unironic commentary. But then they'll do things like a drive cam. It's simultaneously ridiculous and bizarrely fun.
Last Week Tonight has sponsored the newest tournament or race series or whatever you want to call it (previous ones have been named things like Marbula-1), which releases in mid-June.
All I can say is that it I find myself really engrossed in the whole thing, but I could not possibly explain why.