I am not sure if you aren't answering your own question? It doesn't really make sense, but subscription-based apps can offer a free trial. It doesn't seem to be

I am not sure if you aren't answering your own question? It doesn't really make sense, but subscription-based apps can offer a free trial. It doesn't seem to be limited to categories like music and video either, because my current banking app (iOutbank) has offered me a free trial before I have to start a subscription. Non-subscription apps cannot offer a free trial period because of §11.9: "Apps containing content or services that expire after a limited time will be rejected, except for specific approved content (e.g. films, television programs, music, books)"