I just read my initial review. I pretty much understood from the beginning what "Billions" is all about. Or better what is and what isn't.
I wrote back then that the show is basically a Soap opera because of the strong relation between the characters. More specifically the confidant of the billionaire Bobby Axelrod (Wendy Rhoades) being ...married to the D.A. and sworn enemy of Axe, Chuck Rhoades.
In this finale and in the episode before that, it is explored (and exploited) something totally unrealistic. Wendy took incriminating notes (like it was sooo difficult to remember the session with her more important client) in the form of single words like "bribery" (!!!).
IMO always, it is bad writing to base a major plot arc and the seasons finale to something like that.
Anyway. After seeing all 12 episodes, this series is all about an unnecessary pissing contest between 2 ruthless people.
You see, there is no actual hero in this. D.A. Chuck is not a noble person either. He might force an unknown man to pick up his dog's poo, but he is not an honest or lawful man. And how could he be? A guy who's so deep in his passion of BDSM. Who can't hold himself. Who blackmails people. Who tries to enforce the law by continuously breaking it.
Overall: As I wrote in my initial review, this is undoubtedly a Soap opera. That means it has a totally unbelievable setting and tries to impress you with cheap tricks like big numbers and expensive gifts and expensive talk, which in the end, they don't cost a dime.