So yeah why would people prefer to play on any other place with higher house edge when they can simply play here with higher chance of getting lucky
Is this intended to be a question?
If it is, then the difference may not be that much. For example, you say that the house edge at blackjack.fun is less than 1% but by how much exactly? If it is like 0.99%, then other factors would most certainly be prevailing over it like casino's popularity (read, you won't be scammed and your money stolen), convenience (e.g. deposit and withdrawal options), user experience at the game itself, rumors and accusations of unfair play, and a whole host of other things like personal prejudices and preferences