Why NVDA abandons the acquisition ARM？

Earlier this year, $NVIDIA (NVDA.US)$ abandoned plans to buy $Armada Mercantile Ltd (ARM.CA)$ from SoftBank, largely due to the company's slew of regulatory and antitrust issues around the world, including in the United States and ARM's home market, the United Kingdom. After the failed acquisition, SoftBank said it would seek to push ARM to go public, with a potential initial public offering (IPO) in the United States.