the site is stealing peoples money with fake bonuses. they dont listen to complains.
there are speculations that the site is frequently being sold out. each time a new person buys the site,, he changes the bonus requirements and rules
Which bonuses you are talking about that you consider as fake one and which complains you are referring to?
As I can see, you were so active in participating their Free BTC price prediction for several dozen rounds, are you complaining about this promo?
In general, changing requirement or rules on bonuses is something normal especially if your speculation about the site is being sold is true.
Even if there is no change in the ownership, changing rules/requirement is still normal, cant be considered as red flag unless the change is done in the middle of the process of player taking the bonus.