It could make a such a difference if you and others did that! You can't really expect the Medium staff to catch all the "tells" a subject expert would.
But the apparent non-disclosure seems out of control in certain kinds of stories, and if it isn't stopped, members will flee the platform in droves. I've also sent a publication editor a list of suspect stories by a contributor, which might help, too.
Some editors care a lot about the AI issue and might be able to take helpful steps (e.g., rejecting some contributors) before Medium can resolve larger issues. Thanks a million for your interest.