You reveal your identity only to Jumio
That part is clear to me, and that's the part I'm not ready to do.
Is the problem just Jumio or any KYC service?
this is a problem for many people. Why would you want to share your balances with Jumio or any KYC service? They can sell your data to criminals, share with government. Data can be stolen. And you become a target for $5 attack.