Yes, that's the biggest hypocrisy that can't really be explained without partisan intent. Talk radio is almost entirely right-wing and always has been. AM signals - too low quality for profitable music stations, but far-reaching and the natural home of low-cost talk networks - have always been heavily weighted to right-wing content.
That wide reach is the chief reason why, despite the GOP always favoring the rich in their actual politics, they started heavily gaining support in all rural areas around the country from the 90s onward. In many rural areas, the AM station with Rush Limbaugh was the only - or one of only a few - they could tune into.
PC costs certainly aren't helping, but there's an entire cross-section of income and age demographics whose only computing device is and has always only been their phones.
I was curious so I looked it up. This site suggests 1 in 7 households in the US "either lack a computer at home or rely solely on a smartphone for internet access", heavily weighted to lower-income states like Mississippi, West Virginia, Arkansas and Louisiana: https://www.benton.org/blog/computer-ownership-and-digital-divide