You might argue they distributed the money amongst all existing money-havers, with each getting a microscopic share in proportion to how much money they already have. In that case it's a donation primarily to the rich.

But it's also no different than if they stuck it under a mattress for 10 years, at least until the 10 years is up. So that's also sort of a donation primarily to the rich.

Of course when the 10 years is up and they spend money, more of it will wind up in rich people's accounts than in anyone else's, if not immediately then eventually (otherwise they wouldn't stay rich.)