I didn't mean to suggest that iNat is proactive, they may well be.

IIRC, the exact chain of events was: Invasive Species Observation posted -> a curator at the LA Natural History saw the post and notified the CDFA (Agriculture Inspectors) -> CDFA contacts iNat to get email address -> CDFA contacts my SO. I don't recall whether iNat had a built-in messaging service at the time (they do now).

Regarding endangered species, the California Department of Fish and Wildlife evidently joined iNaturalist, in part to enhance their data collection. They seem to be monitoring iNaturalist and contacting users who have relevant observations. They seem very sensitive to privacy concerns, and cooperation is voluntary. I'm thrilled a state agency is engaging the public in protecting our natural resources.

These state employees have indeed been proactive.