I haven't try it out the Blackjack.fun but I have account on their website but 15% interest on staking is eye catching. Do you know which coins supported their staking I mean are in 15% APR ? Are they have launched own token or support bitcoin or and stable coin ?
You can stake any coin listed on this casino.
I was in their signature campaign for a couple of weeks, so I kept staking for a while. Everything is very simple, one click is enough to open an investment and every hour you get a reward (which you can also add to your investment assets).
Also, you can cancel whenever you want, the redemption period is instant, so the funds are available to you immediately.
Don't take this as my advice on what to do, I'm just talking about the possibility and you are aware that there is always a risk. Also, I would advise you to enable 2FA account verification in that case, even if you increase the security level.