AI is already being used to keep out fans they don't want, they don't need them to submit photos or give permission[1]. In addition to being a vastly smaller and harder to replace group than fans, police are also far more organized than fans. That's the only reason they are being asked.
This is the same police union that’s argued that releasing the names of police formally accused of misconduct is a privacy violation, their concern for privacy does not extend further than the ranks of their union and certainly not to the broader citizenry.
[1]:https://www.nytimes.com/2022/12/22/nyregion/madison-square-g...