Does anyone else think this is quite a serious issue? Isn’t this also an invasion of privacy (of sorts)?
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Yeah that’s not fkn cool at all.
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Reason why my Sonos speakers are getting thrown out soon.
This is just some user suggestion though yeah? It’s not actually a thing?
Can you firewall them somehow?
It is a thing that you are currently able to connect to any Spotify Connect-enabled speaker over the Internet if you have previously been connected to it over wifi - I found out the hard way by accidentally playing some music at a friends house. 
That prompted me to look for a way to disable this behavior, which led me to the linked post above.
Ahh yeah, I misread it as asking for the feature, rather than asking for it to be disabled.
If I turn off my phones wifi Spotify doesn’t give me any options to connect to network devices, and I don’t have the ‘show local devices only’ setting switched on.
I have three different Spotify Connect devices - if I turn off wifi on my phone, I can still connect to two of them; the only one I cannot connect to is also a Google Cast device, so maybe that one utilizes some (local network only) Google Cast protocol rather than Spotify’s own? (All three devices are from the same manufacturer.)