For those who wants the actual background story this is quite an amazing read but i dont know how good of a job google translate will do:
Vanity Fair article
TLDR: Cyril was the cousin of Marco mouly who was behind the Carbon scam with arnaud Mimran.
They were part of a huge carbon credit scammed that defrauded more than 5B Euros all over Europe.
Insane story with already a movie made about it
"Carbon"
And this is how Cyril was basically funding his degen spree. He is now in Jail tho..