Sonos supports Apple Music. You can play your iTunes library through Apple Music via the Sonos app. If you use an iOS device, you can stream Apple Music to most Sonos devices via AirPlay.

Apple are slowly moving everything away from iTunes branding. When depends on the device.

For Mac users it went away with Catalina in 2019. Replaced by Apple Music, Apple TV, Apple Books & Apple Pod casts.

While it is still possible to download iTunes for Windows some of the new apps are out on Windows, so it will go eventually. For syncing there is a new Apple Devices application.

Devices are using Apple TV and Apple Music already.

Movie/Audio purchases made on the iTunes store show up in the respective TV/Music application and integrations