Your public good argument is applicable to AV-collected data and use.
Robin Chase
102

Regarding the boundary to data sharing, the question reminds me of a quote by Dalai Lama XIV:

“If you can, help others; if you cannot do that, at least do not harm them”.

With city management data should be openly shared, if not, a set of minimum thresholds should be compulsory for any service to operate.