Could have been some really grim luck on your side resulting into such great loss. If you are getting something off of your ventures even though you always end up losing more, I think the problem is not with bitcasino.io but on your end because you have no control over your spending. Then again, this is your money we're talking about, so spend as you please. For the record, I have watched 15 minutes of the video and have not found something anything out of the ordinary.
Just to be clear I am not coming into bitcasino.io's defense in stating what I saw based on your video. We all have some bad streaks, with others being the extremely unlucky ones. If you're really sure that they are, in some way, trying to rob you off of your money, put up a post in Scam Accusation and explain your side on there.
Okay take this for an example. I buy 6 x 600 EURO bonuses on sweet bonanza, I get 9 dead spins on 4 out of the 6 games. I lose my entire 5000 EURO balance. How does that not sound shady? Not a single decent win on 6 bonus buys for 600 EURO? When I purchase a 750 EURO bonus on wolf legend megaways I win 11 EURO back on 18 spins lol.
Then take the session/game hash, see whether there's an anomaly off of the readings.