they change player seeds on one large bet and i know this as a fact as i changed the seed before hand because it was a big bet
also 1btc is a lot of bets and many more bets placed all pretty good volume
its about house edge and lies they say
As I said you should provide screenshot or something and to repeat we don't know HOW did you bet. You could have played 1000 small bets and 1 big bet and to be honest it's not so hard to check, before your every bet you can see server seed hash and after each bet you can see the same hash, which is changing together with your client seed every single bet(unless you write your own client seed in that case only server seed change).
If you don't trust their fairness checker you can always check bets manually, you can even check slot reels
https://bitvest.io/img/slot/reel0_l.png. Unless you can do all that you shouldn't spread FUD like this.
the site is provably fair -their provably fair tab explains it all and shows you every roll's hash before the roll,you can verify your bet result
They should add nonce.
