I'll do you one better. Even if you take ALL their money, that's less than 6 months budget. You steal it from them, spend it in a few months, and you're back where you started in no time. It doesn't fix anything or change anything, but introduces tremendous problems (like inflation).
And besides that and completely ignoring all these direct problems, these assets are not even liquid (Surprise surprise, Jeff Bezos doesn't store $5B in his safe). So, in order to cash them out, you're gonna have to sell them on the open markets, crash the stock markets, crash real estate markets, etc, which will lead to much higher unemployment, and pension funds will be destroyed (just like in 2008), and millions will go bankrupt. And all this even ignores that the net worth you're assigning to them ignores slippage, so it's much less than 1.8 Trillion when sold on the open market, ignoring automated bots that will sell even more to protect their hedge funds.
Yes, let's do all that destruction in the economy just for 6 months worth of spending. Great plan!
Like I always say: A bunch of ignorant, uneducated, stupid and entitled teenagers who don't know anything about the economy want to decide how the economy works. Go read a book, and stop telling us how to run the world before you learn how the world works. Go learn, and your realistic suggestions are welcome. We all want a better world.
The sad reality is that your revolutionary wish will kill millions of people in the process due to the failing economy, since no economy means no food delivery, no functioning infrastructure, etc. Well. I'm no moral judge here so it's up to you. I'm just telling you it's really expensive. Careful what you wish for.