Network administrators can block Google Sites proxies without blocking Google Sites entirely:
A proxy unblocker hosted on Google Sites acts as an intermediary between your device and the broader internet. Instead of connecting directly to a blocked site like YouTube or Discord, you connect to the Google Site, which fetches the content for you. google sites proxy unblocker
If you are developing a feature, the trend has moved away from simple "unblocker sites" toward sophisticated, rotating residential proxies that utilize real user IP addresses to blend in with standard traffic. you connect to the Google Site
Because the request originates from a Google domain, filters that allow educational tools may overlook the "hidden" traffic passing through the proxy. How They Work google sites proxy unblocker