No idea, but it wasn't a blanket ban. Plus, does Roon definitely use TuneIn for BBC programming?

Changes to access of BBC live radio streams on selected TuneIn platforms in the UK

Does Roon have an agreement with BBC that provides them with the data that the BBC require?

Quote
When we make our programmes available via third parties, we ask that those platforms either allow you to sign into your BBC account – or provide us with meaningful data directly. Unfortunately, TuneIn doesn’t do either of these, so we couldn’t reach a data sharing agreement with them.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).