> I see. I looked at https://play.google.com/store/apps/details?id=eu.faircode.em... and saw nothing.
I can see?
FairCode B.V. marcel+play@faircode.eu <redacted>
Anyway, ads are just a sidechannel for purchase. There is a product advertised, someone buys it and developer gets the cut from the seller of the product. This is how ads work.
Just in case they're looking in the wrong place (looks like they moved where this information was since I last looked), you have to expand it in the sidebar on the right.