If you are going to fill out KYC, make sure you are dealing with the best and legit site so you can have your peace of mind.
This is good advice though our KYC information is always vulnerable no matter how good the security of a site is. Bigger sites like Binance got hacked and KYC information of many people were sold on the dark web.
You have a point, there's always a possibility of data breach and hacking but it depends on the platform's security. That's why it is important to not disclose your personal information to just random site. As Johnyz said, make sure the site is legit and reputable so you're certain that your informations are secured. Anyway, it's been a while since Roobet implement kyc and gamblers already used to it (not a big deal anymore) because nowadays kyc is already common for regulated casino. That's why I wonder why this issue is often discussed here.
For many years of Roobet's operation they never encounter such problem on their casino so we can safely say that their security is really good that's why we don't need to worry those data breach issues which happened to other platforms. Many says no system is safe but provably hackers right now will not waste their time to hack data on casino since for sure their target is the funds stored there so we can safely say for now that Roobet had a thight security that's why so far they never encounter any same like issue.
Roobet will not became reputable for nothing so for sure that we can rely on them knowing that they also want to protect their successful business so for sure that their casino security is one of their priority to look at to avoid this said issues that might hit to them.