The second major use case for proxy servers on the PS3 was content.

It was a useful hack in the late 2000s and early 2010s, but due to security changes, slow speeds, and better alternatives, it’s not worth setting up unless you’re doing retro experimentation.

Specialized proxy software is often used by the modding community to install hybrid firmware (HFW) or bypass firmware update checks without needing a USB drive. How to Set Up a PS3 Proxy Server

A proxy server for the Go to product viewer dialog for this item.

In simple terms: