Actually, that license bit is not the case exactly. Anyone can listen to the Naim stations here. For free.
https://vtuner.com/setupapp/guide/asp/BrowseStations/Searchform.asp
Unfortunately, it is web only and vTuner is the absolute worst! (Yamaha and others left it for airable, which is back end only and so much better…). Radio.net is another one which tends to have a lot of stations but, not this one and it is basically, web only. But the people are super easy going and nice.
If it was not so crazy to get a station on iHeart, that app is a keeper but, most stations — especially non profit and non USA — don't use it because of an onerous process to get a station on it. This means many non profit stations are not able to be on it.
Oh beloved Apple, let us enter internet radio station URLs like you once did please? And save them for easy play later… like you once did…