The level of "endogamy" within the rich and powerful is definitely slowing things up. We have strong evidence that these people are all at least acquaintance if not friends. It may not be great for your career to investigate/prosecute top level politicians and billionaires. Actually the positive of the documents release is that people see it.

Then a big factor is that being invited to a party where children have been rape doesn't prove you partake to the rapes or even have been aware of it.

Finally, money means that you can afford a lawyer slowing things down by writing various requests to the court. Your lawyer will tell you to save your money and do the necessarà/efficient one. But for people with virtually infinite money, a team of lawyer can slow down the things