> Even if I wanted to sell user data, there wouldn't be anything to sell.

You might be surprised. You wouldn't need to sell user data, but there certainly is something of value from the cloud offering you (and your users!) should be aware of.

The logs of location sharing uploads and queries contain two pieces of information that together would allow for certain types of analytics:

    * Approximate location even from partially redacted IPs (via geoip lookup)
    * Timestamp of action

The value of that information is not in individual users or their data. It's in their aggregate behaviour in locations over time. Want to know where privacy-aware users are more likely to be found? Or how about where the trend of privacy awareness is increasing or decreasing?

The people who are actively aware of their privacy are more willing to pay for good services. That's a marketing cohort all by itself.

NOTE: I'm writing this with my DPO hat on, because even if the impact assessment for using this kind of service would be pretty simple, it would not be a no-op.