Security-wise, I'm sure there are some major concerns. But on a practical level, my friends were waking me up at 2am but accidentally selecting my speakers and now I am doing the same to someone who owns my former speakers. It was enough for me to switch from heos to LG wireless speakers.
Re: Can I delete a Spotify Connect device from the list?
I wish I had some sort of solution, but I'm having a similar problem. I'm at college, so the wifi and ethernet is all on the same network, and now I have a ton of PS4s and sometimes ChromeCasts depending on where I am. Unlike what I'm seeing here, I've personally never logged in on any of those devices, nor have I played music from it. Thankfully I haven't experienced any playback issues, but it's still annoying and honestly uncomfortable. I even contacted Spotify and was told to try the "log out of all devices" option. Which, as previously established, worked for a few minutes at most.
I was dealing with this issue too, and found a solution:
- Change password
- Logout from all devices (using Spotify web portal)
I first tried doing this using only the second step, but that doesn't work. The thing is: devices appear to be saving the password locally. So when you logout all devices, they will simply log back in. That's where the password change comes in, which prevents those devices from logging back in (until you'd login with the new password, of course).