[zmgsabst]

Also, traditional intelligence services do a lot of OSINT (which is about source, not publishing).

“Open Source” in this context is about publicly available information — a source in the open.

[danpalmer]

Thanks, I was somewhat unknowingly conflating the openness of the data (I know a bit about how Bellingcat sources their data for example) and the public service nature of the open reporting. I get the impression that "OSINT" is typically used to mean both, even if it technically refers to the former (rather akin to software where it refers to both source availability and licencing, but in casual use often refers to the former).