I wonder what’s the upper limit of transmissions a single device can upload to Apple servers? If the Apple device has no cell service or WiFi, how long will the

I wonder what’s the upper limit of transmissions a single device can upload to Apple servers? If the Apple device has no cell service or WiFi, how long will the history of that location ping reside on device? Also, is there a DoS vector here? - attacker manages to simulate 1M+ Bluetooth devices - victim randomly passes by and it crashes their phone due to a massive number of devices in single location and constantly uploading to Apple servers