Compare to any other casino which is not been tested over the years I can also say that its quite safe to provide KYC in roobet because their reputation is good assurance that they will not rug or endanger us by leaking our data's in any forums or anywhere.
Even if I trust Roobet 100% and consider my data "safe" at Roobet, this is by no means a guarantee that the data cannot be stolen. There are a lot of possibilities what could happen without Roobet being able to take countermeasures, e.g. a deliberate leak of an administrator.
What I want to say is that even if the reputation of a casino is good, you should never assume that the data is safe and nothing can happen to the data.