You can cycle keys if you don't want to log in, as your concerns are very valid. Some of us are on degoogled phones so we aren't worrying about that issue, but, the reports could be anonymized at the client level, though, the relays would know too much to make most people comfortable. Rotating, random keys would be the just best thing. 🤔

Still, if you're the only active user in your area at first, rotating keys won't help much.

I used google as a proxy of someone might interested in analyzing it. Obviously it could be anyone or any government as well, foreign or domestic.

It doesn't use your npub. Generates random ephemeral key for each event.

That's good. Still skeptical about the public posting of individual gps data, that's never privacy friendly.