With the kind of money he has, Cuban should know that Angel investing is nothing new.  I was part of a startup in the late 90s that was entirely funded by angel investments.  These private investments are just business as usual.  The only new thing is the organization of micro investment angels to allow investment from people with less money.  Personally I think those are a bad idea and smart people would be better putting their money in an index fund, but I&#x27;m not a big risk taker.