Companies, except Twitter and Kingdom Holdings, take money from Softbank's Vision Fund. This fund incidentally has a lot of backing from the Saudis. Softank is

Companies, except Twitter and Kingdom Holdings, take money from Softbank's Vision Fund. This fund incidentally has a lot of backing from the Saudis. Softank is a famous name in the VC and tech circle. So, I am wondering how many tech startups do a reverse due diligence on the companies offering them money? Is that a normal expected practice?