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.
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.
[0] https://thisisunpacked.substack.com/p/irs-direct-tax-filing-...