“Also, since the majority of Norwegian households already had a digital radio and DAB was becoming the more common way of listening to the radio, it was considered a good time to simplify things and bring costs down by switching off FM.”
Complete and utter bullshit. DAB(+) was never a major way of listening to the radio before they decided to shut down FM. They never reached their goal of getting 50% of the population listening to DAB before shutting down FM. With weeks left of their experiment to get people over to DAB they saw that there was simply no way to get half the population to spend £100 to get worse radio, so they changed to rules from “shut down FM when 50% listens to DAB” to “shut down FM when 50% have tried non-FM radio including but not limited to streaming, DAB/DAB+ and satellite radio”.

Most people still don’t have DAB, because the coverage sucks when you get outside of dense population. I drove from my moms apartment to her summer house, in a rental car with DAB, just before they shut down FM in her area. I lost FM coverage twice for just a few seconds each time, but lost DAB over 30 times, sometimes for minutes at a time, during a 90 minute drive. I’ve tried to get DAB working on my mothers £500 stereo as well, but brick walls seem to block all the DAB signals. She ended up replacing FM with internet streaming.