The discrepancy you're experiencing with family safety filters may stem from how different types of content are categorized and managed. Microsoft Family Safety provides web filtering that helps protect children from accessing mature websites, but it primarily focuses on specific categories of content deemed inappropriate or harmful.
Web filtering is designed to block access to certain categories of sites, such as adult content, gambling, and violence, but it may not cover all potential sources of NSFW content, especially on platforms like Twitter where content can vary widely and may not be explicitly categorized.
On the other hand, downloads from sites like Newgrounds may be flagged due to the nature of the files being downloaded, which can include potentially harmful content or file types that require additional user gestures for security reasons. This is part of Microsoft's efforts to ensure that users do not inadvertently download dangerous files without proper consent or awareness.
In summary, while web filtering aims to block inappropriate sites, the filtering mechanism may not catch every instance of NSFW content, especially on social media platforms, whereas downloads from specific sites may be restricted based on file type or security protocols.