As I understand it, a 'Virtual Private Network' (VPN), is strictly of use for the sole individual in personal computing between a browser and the world wide web. Those using a computer for operating a website or radio stream cannot benefit from running a VPN. Is this a correct viewpoint?
No, there really isn't any point in running a VPN for a streaming connection, as per the linked definition.
VPN's are typically used by home users to change their IP address so that they can be anonymous. They're also useful to get around geo blocking (as an example, the BBC has a huge archive of video and audio, available for streaming free of charge, but only to UK residents - a VPN with a server in the UK can make it appear that you are located there).
It is possible to block VPN access by purchasing services and/or apps that can detect if someone is accessing your server via a VPN. Believe it or not, the other 'friendly neighborhood' Part 15 website does that. Why? Good question.