It’s illegal to record without consent in some states. Posting such a recording is problematic because it’s evidence of a crime, not a crime in and of itself. If it were, there would be cases of journalists posting transcripts from illegally recorded conversations, which isn’t happening.
1. https://en.wikipedia.org/wiki/Telephone_call_recording_laws#...
2. https://www.eff.org/deeplinks/2020/06/you-have-first-amendme...