I think you possibly misinterpreted how crash games work. Crash game is not similar to dice where you have a server seed and client seed. Crash games have a chain of server seeds and they don't have client seeds, as the output has to be same for all the users who make a bet on a particular server seed. If they use client seeds the output of a particular seed will be different for different users. So instead of using client seeds, they use the hash of a future bitcoin block into the algorithm so that output is the same for all the users and provably fair. Other popular crash games like bustabit, stake etc, have also used the hash of a future bitcoin block instead of client seeds.
Crash uses a client seed, it is always the same one for every bet. It doesn't look like there was a seeding event for their crash game
Rhavar
pointed this out in the past, he actually pointed out a few flaws in their fairness which had a 100 ETH bounty offered but it seems they kept brushing him off. I see that they updated their fairness for other multiplayer games using the correct seeding event/scheme but crash must have been left unchanged.
Why the house should not be trusted to choose this seed:
https://bitcointalk.org/index.php?topic=5088875.msg49092702#msg49092702Actually, there was a seeding event. If you read a little further into the thread you will see Rhavar's approval of the new algo. I find it hard to believe you did not know this.