Thank you for writing, Angelina Jolie!

I'd love to, but I try not to comment on specific casinos unless I've taken a fairly deep look into how they operate. This takes a considerable amount of time. Hopefully, there are some sources where others have taken a look at these websites? Are the ones you're referring to on-chain betting?

I can make some general comments about shuffle-based provably fair systems, in case you encounter them. I know it may not be helpful for the specific casinos you're referring to, but you never know.

When I looked into the shuffle-based provably fair systems, many of them suffered from the following:

• Sole control over the initial arrangement of the cards. This is the basis of shufflepuff, which I believe "breaks" the provable aspect of "provably fair" for many of these casinos. Adapting shufflepuff to their provably fair method would allow a casino to take advantage of you.
• Modulo bias in the shuffling algorithm. This is normally not a big deal for most applications but a considerable gaffe for a casino (which markets fairness). It shouldn't exist, really. In general, depending on where the Fisher-Yates algorithm starts shuffling (the beginning or the end of the deck), a casino can favor cards in certain spots. Though rare, sophisticated usage of it can result in the player being denied a card (like an Ace in blackjack) or given a card (like a 5 or 6).

If you have any other questions, let me know!