Even more important: REPORT it to Medium. Undisclosed AI use is a Medium rules violation.
You don't have to be absolutely certain AI was used. It will help Medium just to know that people suspect it. Medium can investigate further on its own.
To report a story: Click on the three black dots at the top of any story. On the pull-down menu, you will see a "Report" option. Select it. You'll see more options, including something like: "Rules violation." (Or write to Trust at Medium.)
Remember: All members divide up the same "pot," and scammers are claiming more than their share. They are taking money from you. And if your earnings are down, they may be part of the reason.