If at all possible, I would want a hard guarantee that my photo ID and all derived information (e.g. my real name (as in the case of Roblox, they don't care about your identity, just your age)) would be completely deleted as soon as possible, as well as a description of exactly when that would be (e.g. "we have to contact your federal government to verify the authenticity of this ID, and then ensure that they know that we've verified your user account, and then we'll delete everything immediately - this typically take 4-8 business days, and we'll email you when the process is completed").

Regardless of the above, I would require that no personal information linked to my ID would be used for any purpose (analytics, marketing, ads, or sale/transfer to a third party) except identity verification.