Since Rollbit is still a new casino the likelihood of them just taking everything and running is still greater than for more established casinos such as Stake.
New site is just mean unproven. There is also risk of embezzlement if you play on established casinos. Remember:
Short con game = small profit
Long con game = huge profit
Instead of using age and reputation (which is easily gamed) why don't you just try the gaming experience. The taste and feel of "serious business" sites are just different.
To be honest, I also tend to trust more those bookmakers who try to refrain from deposit bonuses,
Yep, I had an awful experience with these deposit bonuses with complicated terms and conditions. Nowadays. I'll just ditch this type of casinos. I'd rather have rakebacks and level up bonuses. Clear, simple, and no shenanigans.