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Why is Southern Cross Austereo pushing all their programs on to apps?
The BBC research has found that the least expensive method of distribution is DAB radio. We use DAB+ which is even less expensive per program. https://www.bbc.co.uk/rd/blog/2015-07-from-lens-to-screen-an-industry-collaboration-for-sustainability
Remember that broadcasting is unidirectional so the number of listeners doesn't change the cost to the broadcaster. Using apps all use bidirectional communications, but there is only a tiny amount of data returning to the broadcaster. Telstra is the biggest single consumer of electricity to power all of those mobile phone towers. Add to that the NBN going down most streets in the country.
DAB+ radio started in 2009 to 60 % of the Australian population, but broadcasters push apps instead of buying a digital radio.