DAB is moderately successful in the UK in terms of the number of people listening to it, though the sound quality is dire because bit rates per station have been reduced so much. And yet most who've heard it say DAB sounds great, when what they mean is they never had a decent FM antenna and they like the lack of FM hiss on DAB and are ignoring everything else bad about it.DAB just never took off with the public, most people have no ideal with it is or was.
Both my Marantz AV7701 & 7703 Pre-Pro had it built in but a couple generations back they dropped it. Now latest 7706 has completely dropped the AM/FM tuner.
Also the listening numbers are deliberately confusing. What is quoted is digital listening, which bundles together all of internet streaming, DAB, terrestrial TV and satellite TV for radio. This is widely believed to be done because if not DAB share of listening would still be well below 50% whereas the combined digital figure is above 50%. These are all pre covid figures, I've seen nothing newer.