"Shark Tank" star Daymond John is having a hard time enjoying this year's NCAA Tournament ... saying he believes it's "horrible," and is actually "modern-day slavery."
The 53-year-old businessman spelled out his beef with March Madness to Harvey and Charles on "TMZ Live" on Friday ... explaining he thinks the players are getting a raw deal in the huge event.
John said there's a ton of people making millions -- if not billions -- off the tourney ... yet players aren't seeing much of the pie at all.
"The players make nothing!