Note: Kroll still has control of tons of companies. The investigative arm is now called, "K2 Intelligence." Also, I assure you this was not some random, "do gooder" this was very intentional, and likely the reason that Cavemen and then Kroll show got any ratings, at first. The email achieved its intent - get Nicky some ratings - and then best to cover up that kind of unseemly nonsense.
In response to how he gets the voice for his dismally lame, "CZAR" character -
(WTFFF Riff Raff??? A fraud billionairess son calls anyone, "Rif Raff"...Oh Nick Kroll you are such a fruity and loathsome sack of shit)