Why make it easy for people to submit their tax return - when the government already has the bulk of that info since their employer, their banks, etc, already reported it - when INSTEAD you can let rich people hawk their paid products to get money from people for it instead? While still requiring more effort.
The corruption era is very simple: the government won't be allowed to directly provide a service that someone else could make $$$$ by being a middleman for.
It's somewhat ludicrous to have to "file taxes" in the computer era in the first place, but there's a large ideological resistance to both taxes and the government that in some of the more paranoid wings of the country that is well-exploited by the rent-seekers here.
They only just launched Direct File after years of lobbying to prevent such a system by a consortium of accounting software companies[0]. If it falls apart people will continue to be forced to pay money to these companies just to file their tax.
As a comparison, in my country you could submit your own tax return using government supplied desktop software since 1999, and in 2015 that software was replaced with a web product. 1 in 3 people submit their own tax returns using this product.
Let’s pretend to think that through a bit as an exercise. While it might not be Musk himself, who could possibly benefit from firing all the people who developed direct file?