I feel that it’s safe to share KYC data with Roobet, because they’re taking extra precautions for protecting the user’s KYC details eg using 256 bit encryption, hence there’s very little chance of KYC details ever getting leaked.
The 256-bit encryption isn't an extra precaution but it is pretty much an industry standard, it's being widely used. You can see that Roobet is using it for the SSL/TLS, so it is surely safe in terms of transmitting any data.
Hardly anyone will attack the transport route itself if someone wants to access the data. The encryption of the transmission path therefore plays no/hardly any role. ~
SSL/TLS is the tip of the iceberg regarding security concerns, but surely it does what it needed to do to protect how the data being transmitted. And by what I mean about data is any information that you shared or will share with Roobet and to/within its third party.
If it doesn't have any SSL/TLS or only HTTP, not HTTPS, which is more known. Then anyone who monitors the network can see whatever data is being sent, including ISP, governments, NSA, Hacker, or any adversaries you can name.