For foreigners who have a valid residency permit things are easy because you'd already have income tax receipts and such. However, for non-local Chinese nationals who are trying to work as a taxi driver, I doubt they'd have the requisite income tax receipts to prove that they're working legally in Shanghai. IOW they simply can't get a Shanghai registration even if they have the money. There's also the issue that simply having enough money is no longer sufficient to win the Shanghai registration auction since there is now a price cap. It's essentially a lottery just like Beijing but you stil have to pay 100K for it.