Too broad. Wealth hoarder describes everyone with a mortgage as well as grandma Sally and her pension plan. Anyone who saves for retirement is a wealth hoarder.
There are millions of people in the U.S. whose wealth comes from the increase in the property value of their family home. This is unearned wealth.
Of course, you’ll have a hard time convincing most people of that last bit. Which is why billionaires are the more popular enemy rather than the middle class.
Why not do that? Because of inflation, you lose money doing that. It’s the last resort of someone who has no other options for saving their money, such as low level drug dealers.