There are no runs on almost any of the intense category, is that because simply no one has done it yet or does that category even exist?

You have to unlock Insane difficulty by beating hard difficulty iirc. Intense is just a really hard difficulty, which is why not a lot of people have run it.

Just sounds like a good challenge @Silo_Simon

Oh yeah it's a good one for sure! Airshock, Fuzzyness, and I are the only people who have run insane story mode, and it's pretty raw lol. Insane All Boards is also very tough