It's kind of a "life arc" that gets fulfilled when you've done it all and have all the money in the world, and reach a certain age. It's a very traditional arc for a humane human being.
That API was already reasonable before he took over Twitter. It was prohibitively priced afterward. You are making arguments out of things where there is objective proof otherwise. Anyways, I think he cut aid programs and fired a bunch of people too. That's a whole nother' matter though (I'll drop the whole holistic argument).
For example the firehose/streaming API more or less require 5 grand a month, so off limits to a indie dev. Does he not even have solidarity with developers?