A friend of mine from Nepal said something along the lines of "bribes are just a lubricate to an intentionally slow and unorganized bureaucracy". Places like China, India, Vietnam, & Taiwan all have pretty well know backdoor policies of this.
Its a bit old but https://www.forbes.com/sites/richardlevick/2015/01/21/new-da... and https://www.nytimes.com/2019/06/14/business/china-ge-siemens... are both good read for this.
I've also known of UN project directors who had to convince governmental ministers that the UN's no bribe policy was not just a bargaining method.