Right here:
Why do we need it? Remote ID lays the foundation of the safety and security groundwork needed for more complex drone operations. Remote ID also helps the FAA, law enforcement, and other federal agencies locate the control station when a drone appears to be flying in an unsafe manner or where it is not allowed to fly.
UAS Remote Identification | Federal Aviation Administration (faa.gov)
“More complex drone operations” means autonomous package delivery drones flying every which way. To avoid collisions they need other drones to broadcast their position.
This has been the goal, from day one. The “security” excuse was mostly silly. Hobbyist drones are a vanishingly small security threat.
It remains unclear how BVLOS will evade inevitable collisions with large birds. It is a reasonable prediction that there will be “public incidents” involving commercial automated drone fleets, likely more than there ever have been or will occur with hobby drones, just by the expected numbers of commercial drone fleets.
It is unfortunate the FAA went down the faux security rat hole to justify this. Honesty would be helpful.
More:
The purpose of Remote ID is to improve safety and security in the national airspace. By knowing the identity and location of drones in flight, other aircraft and ground personnel can be aware of their presence and take appropriate action to avoid collisions. Remote ID can also help law enforcement track down drones that are being used for illegal or unsafe purposes.
https://www.jdsupra.com/legalnews/faa-s-remote-id-rule-represents-2601401/
Remote ID never had much to do with security – it was always about corporations and industry who did not wish to acknowledge they do not have a way to avoid collisions with all possible users (and birds and kites) of the airspace.