Most casino give you a url link to access your camera and take a selfie so it's really not possible for someone to edit their picture first, apply a watermark then submit it. We should also be wary of what information we provide on those trusted platforms. If they ask too much info then we should think twice if it's really safe to comply. For me, a valid ID, complete name and address are already enough to complete the KYC requirement.
Some will still require you for a selfie, to confirm if you provided the same identity especially on your valid ID.
With Roobet, as far as I know its only a level 1 KYC, i just fill up the basic requirements and then everything works perfectly already. Again, if you are against this kind of security, your only option is to look for alternative since Roobet already implement this, and for sure they will stick with this.