I'm not convinced he's actually done that. Pretty much any 'profitable, sustainable business' can afford software developers.
Software developers are paid pretty decently, but (grabbing a couple of lists off of Google) it looks like there's 18 careers more lucrative than it (from a wage perspective), and computers-in-general are only 3 of the top 25 highest paying careers - https://money.usnews.com/careers/best-jobs/rankings/best-pay...
Medical, Legal, Finance, and Sales as careers (roughly in that order) all seem to pay more on average.