Hey Kevin! Thanks for trying to reproduce it!
The thing is – before I wrote the initial post Awesomenauts only rarely produced this alert. It first came up after the new matchmaking was added. Makes sense because its probably the new matchmaking part that connects to Ronimo servers. But it only showed up after a patch or so and after that Apple remembered my approval. After the patch before my initial post it started to show up every time without remembering my approval..
Edit: maybe it has to do with the current app not being signed: https://apple.stackexchange.com/a/113685