Why did no one ever win the Randi Million Dollar Challenge?

There was a documentary film on Netflix (I think it was Netflix) called Superhuman which showed kids playing games wearing blindfolds. 

https://www.imdb.com/title/tt8756802/?ref_=ext_shr_lnk

I watched it in, admittedly, disbelief because this was something that would surely be major news if true. A quick google came up with lots of sites claiming it is possible though I read a newspaper article where the sceptics dismissed it out of hand as trickery.

This is one of those areas which I recall hearing about as a child at school, maybe when I was ten years old. I didn't know what to make of it then and today I'm still undecided. Certainly I've seen some video demonstrations which I reasoned could be simple deception. But that doesn't automatically mean there might not be something worth considering in other cases.