Got this message from Spotify too and were ready to drop my Spotify account - however I mainly use the Logitech Media Server to control all my Logitech devices via mobile apps both at Android, IOS devices and Windows. Since Logitech dropped the Squeezebox devices from thier product list - the Logitech Media server software is still developed and supported and I was glad to see that a new plugin called Spotty were devloped to continue to support Spotify when using the Logitech Media Server.
If you have several squeezebox/Logitech devices or for some reason just want to continue to use your current Logitech device, it's possible to install the Logitech Media Server and use a software plugin called Spotty - then you can continue to play your music from Spotify on you Logitech devices and other devices.
This might not work for you since you will have to install software on a PC, MAC, Rasberry Pi (mini pc), or a NAS server and you will need to have the software running to continue playing Spotify on your Logitech device. This solution demand some interest reading up on how to set up a Logitech Media Server and install software on a pc/NAS. However, there is a lot of guides at internet and youtube on how to use/install Logitech Media Server software.
Since nobody mentioned this solution - it might be worth to consider for some people.