Despite the convenience, using an unofficial, third-party Google Site to access Spotify carries significant risks. Most users ignore these, focusing only on the free music, but the dangers are real.
When you use a Google Sites proxy, you are introducing a "man in the middle." You are logging into your Spotify account (or using a fake account) through a third-party interface. While the Google Site itself is secure, the data passing through the embedded proxy widget is handled by the developer of that widget. This opens the door to potential data harvesting, session hijacking, or malware injection.
In many workplaces and some schools, you can formally request access to Spotify for legitimate reasons. For example, software developers, designers, or writers often claim that background music improves focus. If you make a respectful request to IT or your supervisor, they may whitelist Spotify for your specific device’s MAC address or user account.