I think it isn't going to be that effective a phrase. People don't understand why having lots of money (hoarding wealth) is a bad thing, necessarily, and it sort of implies that, if they were to just spend it it'd make the initial hoarding fine.

Gotta also focus on the fact that they essentially stole that money from workers through labor exploitation. The bare fact that they got the money to begin with is the problem, not just them holding onto it. If they were to spend it all on horrible capitalist enterprises rather than hoarding it, that'd be even worse. Even if they spent it all on "philanthropic" efforts, that's still worse than the workers having their fair share and the government being able to actually have that money to spend on social programs through taxes.