To understand why Google Sites is used to bypass filters, one must understand how network administrators block content.
Most firewalls operate on a "blacklist" system. They block specific categories (like "Social Media") or specific domains (like instagram.com ). However, Google Sites is a productivity tool. It is used by students for projects and businesses for internal wikis. Therefore, the domain sites.google.com is almost never blocked by school or work filters.
But how does this method work, is it safe, and what are the risks involved? This article provides an objective overview of the "Instagram Unblocked Google Sites" trend.