As far i know this is only regular step when people want try to register on gamba.com because i am sure every new players will gets this form while register so in my opinion this is not KYC step because usually it only basic information which the players should be filled those forms and based on my experience playing on this site after register people can deposit and withdraw without kyc required but might be the difference if gamba.com feel your account looks suspicious which they asking KYC and your withdrawal will be on hold until KYC verified

Anyway thanks for the small bonus which Gamba give to me that recently i have successfully to withdraw it after made first deposit on this site