Maybe end to end encryption channels are used but if the government are interested in having those data they will impose many restrictions in order to have that data but i think Roobet has previously also stated that your data is safe with them and not shared with anyone.Security protocol must be followed but we should be careful at our end also.
When you sent and submitted your identity documents for KYC, you should accept that your identity documeng lost forever. It can be leaked or breached anytime in future. You can not control that and even a platform on which you submit your document can not control it completely too.
So afford personal data breach before you do KYC. A good platform will invest into security which is helpful to prevent data breach. However, they can not secure their database 100%.