the corruption business is very similar to racket. the threat being making you lose indefinite amount of time (instead of violence). as a business you have deadlines and not meeting them would make you lose money. sometimes losing money can be deadly to the company, that's why people unwillingly participate in corruption.

the business model of corruption is : 1- slow the process as much as you can 2- some people will have deadlines and will be willing to pay to meet them 3- profit

the slowness is there on purpose, to be able to provide quick process as a paid service