In short, the background of Softbank founders is in plumbing of the financial system. They intentionally bid up dubious companies into obviously unsustainable valuations, with the aim to make them highly illiquid. Faced with illiquid stocks, many of the assumptions behind trading models break down, and obscurities of the financial plumbing come to fore - the water Softbank knows really well. Eventually, index funds include a portion of the bid-up companies on their balance sheets, FOMO investors roll in - that's when Softbank unloads their bags
https://www.readmargins.com/p/softbank-robinhood-and-a-margi...
In short, the background of Softbank founders is in plumbing of the financial system. They intentionally bid up dubious companies into obviously unsustainable valuations, with the aim to make them highly illiquid. Faced with illiquid stocks, many of the assumptions behind trading models break down, and obscurities of the financial plumbing come to fore - the water Softbank knows really well. Eventually, index funds include a portion of the bid-up companies on their balance sheets, FOMO investors roll in - that's when Softbank unloads their bags