Just because it’s percieved as normal doesn’t mean it’s something we should put up with though.
With GPS subscriptions (the ones I’m aware of anyway) they will still navigate you from A to B when you stop paying the subscription, you usually just miss out on traffic updates, map updates and other localized enhancements. If there are any that deny you navigation outside the subscription that’s plain scummy IMO.
I’m not familiar with Sirius Radio but from what I can see online, it’s a satellite radio subscription service that seems to bring new things to the table (like starting a radio station at the beginning of a last song etc). The hardware appears to actually serve a purpose, i.e. it’s the satellite receiver for the radio service subscription. I believe we could compare this to buying a Starlink dish for internet access, and paying the monthly subscription. The spotify device shown here is not a standalone device and is only fitted with bluetooth IIRC, requiring a phone for operation.
In comparison to Spotify, Sirius does not appear to have ever had a free plan - whereas Spotify does… I see is no reason why Spotify could not make their free plan usable on this device.