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Yes. You need to set up Autoplay on the P:5 before you try to use it in this way. I assume you want to play, for example, from a phone in the absence of wi-fi?
It's also worth noting that you don't need the internet to have a wifi LAN and use Sonos for locally stored content. I have used a travel router with USB port, a USB flash drive, and a Play:1 to play music from the USB drive through the Play:1, controlled using the Sonos app on my phone.
He can't. He can play your Spotify if you give him access to your wifi network and he downloads the Sonos app. But Sonos are working on allowing casting the native Spotify app to Sonos, and it shouldn't be long before that will be possible.
You don't have Wi-Fi so anything that needs to come via the web can't be done.
Unless - I don't have Spotify but can stuff be downloaded to work off-line and then played via Sonos
Arc + Sub (Gen 1) + 2 x Play 1/ Stereo Play 3s/ Era 100 Stereo in Kitchen, One Stereo in Bedroom, Play 1 stereo pair in Study, Play 1in Bathroom, Sonos Move 2