Their tiny little fund isn't powerful enough for that. They can try that when they have a multi trillion dollar fund. The reason why the vision fund failed is pretty obvious. They dump their money into late stage companies without actually checking if the business is viable. This strategy works with very young companies because initial investments are very low. One million here, 5 million there. If 95% of companies fail it doesn't matter because there will be a unicorn or two. With something like Uber or Wework most of the crazy gains are already gone. They are way beyond the seed stage. When you invest into them you must be careful and check that you are spending money on a company that can actually net a return. When you are spending more than a billion each loss hurts a lot.