Deezer connect, in my opinion has a design flaw, namely that it needs a logged in user at the side where you connect to. This would mean that on any device you want to play your music on, for example an amplifier , a wireless speaker , any other music server (like pc or dedicated applications like moode audio)
A better way would be that it sends its right to play deezer streams via the client.
This means that anyone in my house can play his music via my amplifer or speakers , family friends and people who are in my household. The only thing they need is a valid deezer account and app on their phone-
This is the way spotify connect works too and makes for way easier implementation
With deezer connect this is now only possible if i log them in to the device they want to connect to. this makes it little practical.