I had removed the service previously but after the 12.2 update I cannot remove it.
In the iOS app, no way to remove my account, only an option to reauthorize it.
The desktop app allows one to remove services, including Sonos Radio, but as soon as I remove Sonos Radio, I get prompted asking if I am sure I want to remove it, it OK, and its removed for 1 second, and then comes right back.
I don’t want Sonos Radio (never wanted it TBH) but it came in an update with no way to remove unless you enabled it first, and now it seems you can no longer remove it either! I already sub to a commercial free music service, I have no need for 2nd. The extra icon is annoying and confusing to users.