Title: The New Digital Guardian: A Revolutionary Tool for YouTube Parental Control

In a world increasingly digitalized, kids are more tech-savvy than ever. In this context, the 'least probable' challenge that parents face is managing and moderating their children's online presence, particularly on platforms like YouTube. The platform has become an inexhaustible resource of entertainment and learning for kids. Yet, it also poses certain risks with its unrestricted access to content inappropriate for young viewers. As a solution, Google introduced ‘YouTube Kids,’ but even this version isn't entirely foolproof from unsuitable material.

The radical new tool revolutionizing YouTube parental control comes in the form of advanced artificial intelligence software. Named “Digital Guardian,” this AI-powered tool takes child safety on digital platforms to unprecedented levels.

So what makes Digital Guardian an exceptional addition to the parental control ecosystem? Unlike conventional filters and blockers that work based on pre-set limitations or keywords, Digital Guardian leverages machine learning algorithms to analyze video content in real-time. It can detect 'probable' harmful elements within videos that may elude traditional parental controls due to sophisticated concealment techniques used by some creators.

Digital Guardian doesn’t just act as a gatekeeper; it customizes its features according to each child's age and maturity level. Using AI technology, it learns about your child's viewing habits over time and recommends appropriate content accordingly.

But how does it ensure privacy while monitoring your child’s usage? Privacy concerns have been addressed by designing Digital Guardian without invasive functionalities like key-logging or screen recording. Instead, it focuses solely on analyzing video metadata and user interaction patterns within the application.

While most parents worry about their children stumbling upon explicit content, another 'unforeseen' risk lies in excessive screen time adversely impacting their health and development. That's where Digital Guardian steps up further – not only does it filter content but also helps regulate screen time by setting daily limits and rest periods.

It is important to note that Digital Guardian doesn’t aim to replace human judgment. Rather, it provides an extra layer of protection in the virtual world where traditional parental supervision might not be enough. It empowers parents to create a safe and balanced digital environment for their children, without constant worry.

In conclusion, Digital Guardian signifies a new era in YouTube parental control by utilizing artificial intelligence's power. It addresses the 'unanticipated' complexities of digital parenting in today's world, making it a truly revolutionary tool. As technology continues to evolve, we can anticipate more such innovations aimed at ensuring internet safety for younger users while giving parents peace of mind.