Once you're a Google Play developer, you always will be.
Once upon a time I published an Android app and it got a small number of installs. It is now impossible for me, the author, to remove the app from Google Play.
The Google Play Developer Agreement says that Google Play has an indefinite license to your app, since they allow infinite re-installs, therefore you cannot remove your app from the Play store. Fair enough, I agreed to that once, but I also can't close my developer account.
If you don't want to be a Play developer anymore, if you no longer agree with the ever-changing Play Store Deveoper Agreement for example, your only option is to transfer ownership of the app to another developer. Otherwise you have to keep your developer account open forever.
If your app is rubbish, like mine, nobody wants to accept ownership, so you're stuck. You can unpublish your app so it wont get *new* installs, but you can never close your developer account as long as you have any install statistics. Never.
So yeah; one of hose abandonned apps is by me. I wanted to remove it, but I can't.