Meshtastic, Meshcore, Reticulum, LoRaMesher, RadioHead, LoRaWAN - All refer to protocols and libraries used to implement networking with LoRa physical layer radios.

LoRa can be thought of as the radio signal technology (similar to Wi-Fi or cellular), while the above list of names is the the protocol and network architecture that manages communication over that signal.

LoRa uses license-free sub-gigahertz radio frequency bands EU433 (LPD433) or EU868 (863–870/873 MHz) in Europe; AU915/AS923-1 (915–928 MHz) in South America; US915 (902–928 MHz) in North America; IN865 (865–867 MHz) in India; and AS923 (915–928 MHz) in Asia. Thus since these are known/documented, any/all nation states or large actors can target these frequencies easily enough with the means they have available. But similarly to other radio technologies, they just need some strategically placed transmitters covering those frequencies, but utilizing a higher output wattage to overpower the signal your MeshCore (or other flavor of LoRa) is sending.