@kitten We are currently very tempted to obtain a GPS tracker for similar reasons :3
But everything seems to work via intermediaries who then put up the data online somewhere, instead of directly sending the GPS data to a specified server we control. We need good privacy violation, not bad privacy violation...
@that that was something I was looking onto as well (in this case not to publish it online, but as an alternative to Google Maps Timeline). I was looking onto Owntracks to do it through tracking my phone, but I also saw OpenHayStack as some kind of "self-hosted airtag" solution with an ESP32 or something, although it depends on having access to a macOS device