Is it against any agreements to make a project on Free Unity, then during the 30 day trial, compile the app and try to sell it on the App Store? I am looking to test the waters before commiting the $$$.
To clarify one thing upfront: Unity Free can not create applications for iOS and alike at all. Thats the Unity iOS addon that can.
As for the question itself: Its fine from what I recall but you will get the permanent watermark bottom right and I'm unsure on its runability beyond the trial period as it is meant for you to trial etc, not to publish content with it.
You are not allowed to distribute the standalone runtime without a valid license. While in trial mode, you are not running a valid license.