@gamingonlinux I've reported the unauthorised Steam entry for 0 A.D (https://store.steampowered.com/app/2158440/0_AD_Empires_Ascendant/) and suggest others do the same.

My text if you'd like to modify it:

Go to the store page and click on the flag just below the supported languages list on the left (marked red on mine).

And here's how I reported it in case you'd like to riff on that.

Here's my report text: "Selling an open source game in violations of its licenses (MIT, LGPL 2.1, LGPL 2, available at https://github.com/0ad/0ad) and without the permission or knowledge of its development team."