We're running some experiments
Advertising underwrites the creation, hosting, and distribution of a tremendous amount of awesome content. Keeping that content flowing when advertising has a down turn requires some creative thinking, and often requires business models that are not free. While we have no plans to charge our community to submit or get access to the Instructables content (because really, it's your content in the first place), we are experimenting and thinking about premium models around how that content is displayed and other features you may find valuable.
If you see something out of the ordinary, please give us the benefit of the doubt while we experiment to find ways to ensure we're around for a long time to come.