I was under the impression that Scoutbook would auto-remove adults who were no longer members.
I have discovered that, for example, someone with the Troop Admin role, whose membership expired in 2021, still had that Troop Admin role. I also found that someone who we did not recharter, and whose only Scoutbook role was Assistant Scoutmaster, was still in Scoutbook.
I only discovered this when carefully reviewing the list of people an email was about to go to.