I disagree wholeheartedly that there isn’t much to study. Direct File was actually a resounding success, especially when you consider how much difficulty governments tend to have shipping good software products. There is a lot of good information in here that government entities can learn from.
It had talented software engineers involved including with the marketplace. It succumbed to political forces
Including how and why it died. That is an important lesson for the entire governmental enterprise, including all decision-makers, to learn: that government CAN deliver something good and one single person should not be in totalitarian control