IMO a capitalist that merely hoards wealth is a bad capitalist. They will eventually be surpassed by someone better.

Good capitalists reinvest in better technology, processes and the labor force that executes their mission. That’s how you stay competitive.

Regardless of whether an economy is capitalist, socialist, communist, whatever, there will be wealth hoarders and exploiters. This is not intrinsic to any economic system, but rather human nature.