> He would own 100% of the contents and make millions simply out of his global name recognition.
I think you overestimate how commercially viable actual teaching is as opposed to infotainment. Either way, infotainment allows him to earn money and talk about a subject he loves. Good for him and people love infotainment, it tickles their brains just enough but not too much to require actual thinking.
There are large groups of people who do care about their own’s and their kids’ mathematical education — some in North America and other continents and a huge number in Asia.
“Teaching pays: Cha said he earned $8m last year. “I’m madly in love with maths,” he said, looking the height of trendiness in his crimson shirt and trousers and tweed jacket, in his office in Gangnam – a wealthy part of Seoul famous for its conspicuous consumption and featured in the song Gangnam Style.”
I think you overestimate how commercially viable actual teaching is as opposed to infotainment. Either way, infotainment allows him to earn money and talk about a subject he loves. Good for him and people love infotainment, it tickles their brains just enough but not too much to require actual thinking.