Wealth doesn't disappear, so you still need to deal with the inheritors and you still have to deal with warlords who aren't notable or wealthy. Would "General Buttnaked" work in the Death Note?

Also, there's a lot of very powerful and wealthy people who keep on the down low. Trump, Bezos and Musk are outliers. If you really want a list for the Death Note, you use the DN to compel a target to reveal their pedoparty friends publicly.