The site does keep track of the winnings and losses of an account, since if they don't then why do the site have the statistics of the amount wagered, and the amount won in each cryptocurrency they accepted? I don't see it the wrong way, in fact, it is helpful for players because they can check their statistics. So the casino keeps the records but I don't think they use it against their player. The "feeding mode" happens in every casino but I do not think it is what some of us think where the casino intentionally modifies the house edge making it bigger and more favorable to the house.. Remember apart from the randomness of the result in gambling, there is also a universal law called the law of average, so if you are winning, it will eventually even out by losses and vice versa.
But it takes many millions of bets for that law of average to work. That's why it works perfectly for all players on the site, but not so much for one particular gambler. For all players it works like this: what's lost by one part of users is evened out by what's won by another part, minus the house edge. The universal law of average doesn't work on small numbers like a thousand, or 2 thousand, it works only for much higher numbers.