It’s fully offline, so no worries there. The GPS is just for your game to know where you are while playing. No ads, no data collected (besides what Google generally collects over the Play Store).

In theory there is one network connection to Cloudflare: I offer a street map download for all across the world. So for example if you’re in Austria like me it looks up which map file you need (simple .json catalog), then offers you to download the map file once (57 MB for Austria). But I don’t track anything there either.

Zero interest in handling player data, I’m in the EU, GDPR is a bitch :)