Ever since the App Store first opened, developers often had "free" in the title of apps to show that this is a free version. It has also been common that the icon is also equipped with a word. But now is the end of it.
Apple has namely changed the rules of the store, and now you can no longer use "free" in the name. If the icon is the word app will be rejected and the developer is forced to remove it. According to Apple, it is about "free" refers to the price, which is not part of an application's metadata.
guess the rule has been to overcome the developer calling app for free but in fact use a fremium model where you have to pay to use the app in a sensible way.
Apps has had a free cut-down version alongside a paid version will henceforth use the word "some" or "demo" in the title instead for "free".