Raspberry Racers

I have been recently going through the Fandom for the Marblelympics and have seen a couple mentions of something called the Fruit Circuit. It has only a few mentions across the entire web and no Fandom page. All I have learned is that the Raspberry Racers, Limers, O'rangers, and Mellow Yellow come from it, it was discontinued in 2016, and has some association with Jelle's Marble Runs. I would like to know more about the Fruit Circuit, its teams that are not in the Marblelympics, events in it, why it has so few mentions across the web, and anything else about it you might know about it.