Did you enable your 2fa function which site has provided you to protect your account? If no, then it is your problem because someone might have stolen your password details and enjoyed you BTC. For your mistake what site can do? Unless you prove that site has stolen your BTC. But this admin is well-trusted and he will not do these cheap things just for your 0.88 BTC.

I think if you don't have setup 2FA, you can blame the site.

This is not the first time happened many times people reported the same mistake in most of the trusted gambling site threads but still people never learn a lesson untile they realise it personally. Once you add any funds to gambling sites, first thing is to protect your account with any security features provided by the site. But it is not a small amount to lose as well.

I see more and more people's accounts hacked here and there.
About one week ago a guy wanted to recover his wallet and lost the wallet content and the money from Polo due to a hack.
Now this problem on Bitsler.
Such stories are coming up .. too often. Still people seem to ignore the basic thing: enable 2FA.

Please people enable 2FA everywhere it is available. Better safe than sorry.

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On a happier note: is there any bonus for the bet 8,000,000,000 or only a "way to go, just a little more until 10,000,000,000"?

excellent! 8,000,000,000 th bet is not a small feat to achieve as a site
an amazing promo,chance to win up to 1 btc plus 0.025x2 bingo numbers prizes for every 100 million bets afterwards
only 145 mil bets or so before the event,make sure you join Bitsler and participate (if you haven't already)

sent a pm waiting for response .

That promotion really makes sense for players and to my mind while it's nearly 7.9 billion, it will pass 8 billion in very short time, maybe in 2-3 days because people will become active in this moment, this promotion pushes people to bet more and more.
Bayron turned fantasy and made such attractive promotion, I will be amazed if we will see new unique promotion in future.

Sorry for your loss, next time be more careful and enable 2FA to protect your account.
Soon we will have weekly billion bet promotions if Bitsler continue to grow at this speed.