@Blort The user visible part of this is the Google Location Timeline. You should be able to disable this.
There are probably other ways too, like explicitly revoking location permissions from the maps app. It might be the Google Services that collect location though, so might need to disable that.
It's somewhat easier to opt the specific device out of location collection or remove the google account from the device.
A nice little Mastodon instance. Mild trolling encouraged (keep it local), but not required. Malicious behaviour is not tolerated. Follow Wheaton's law and you'll be fine.