The quality of answers to this threat has been really low... roughly half of the answers are either plain wrong or do not answer the question.

To clarify, we all agree that provably-fair algorithms are superior to the intransparent algorithms of traditional online casinos! However, the question in this threat is:
Why are Fiat online casinos not adopting the new provably-fair technology?

To have a reasonable discussion on this, please only reply if you either (a) know a Fiat casino that already offers a provably-fair algorithms or (b) give ideas on why Fiat casinos are not adopting the technology.