It is not safe, few motnhs ago incident has been happened and Rolbit Casino has send user VIP level-based bonuses to verified emails of Stake users. It is matter of glitch to get caught on such attack or agreement since some casinos may sell KYC userbase data to third-parties for making more money. Stake has never accepted their fault and the management has deleted related forum posts on the forum. That is why I don't trust online platforms when it is about my personal info.
It might not be safe but when you are only gambling with small amount of money i dont think you will become a target of such fraud? High value target are all those users who gambles large money thus it will catch the attention of the casino and perform a trick to lose your money.
That is very unfortunate it happens to someone. KYC is already flawed right before it was imposed.