Similar question was asked before. I can't find it know but the reply was that it's necessary to do some development activity on the instance to keep it from being reclaimed.
@Hitoshi Ozawa this is no longer the case. Development activity (triggering an update to any update set) within the PDI does not impact the activity monitor. You must log into the developer.servicenow.com site according to the current documentation.
My suspicion is that the change was (at least partially) driven by the fact that it's easier to track SSO logins to the developer site (one database query) than it is to try and gleen login details from hundreds or thousands of hibernating PDIs.
No, you need to login to confirm admin or delegated developer rights before you can create anything. Even if you had an API setup to create the form, the API should require credentials.
