I live in campus housing at a university and was just able to select my friend's PS4 to play music from even though I was not logged into his account / he was not logged into mine. Additionally, I have to option to play from another PS4, and a few other computers that seem to be on my LAN. This is honestly kind of creepy and should likely be addressed ASAP.
The attached picture shows
- My phone on top (cut out on purspose slightly)
- My friend's PS4
- Another PS4
- My laptop
- My desktop
Maybe this a bug only with the PS4 client?