Medium IS aware, but it helps if you send your own DMCA complaint to the proper recipient, as only the owner of copyright can legally make a DMCA claim. (Medium should be able to as the owner of a "compilation copyright" on the site as a whole, and I hope that they are doing that.)

Meanwhile, see this for info, tips, and a link to a DMCA form template:

https://medium.com/@hollyjahangiri/your-content-is-being-used-by-thieves-e0710c50e69c

It's happened again - it's like playing Whack-a-Mole. But you know - we can play this game all day and make them sorry they bothered with this site.