This likely will depend on the administration. With the ACA, for example, you see Democratic administrations try to get more people to take part in receiving su

This likely will depend on the administration. With the ACA, for example, you see Democratic administrations try to get more people to take part in receiving subsidies and GOP administrations not wanting to put additional resources towards advertising them. (Not trying to get into a debate here on whether that's good/bad.) In this case with the IRS program, the WaPo article even notes about the Biden administration wanting to "better serve low- and middle-income Americans entitled to a bevy of credits." As in, they want to make sure folks get all the deductions (and other benefits) they're allowed. Edit: Let me also add that many people use paper forms because it's free (or other reasons). There has always been a publicly-funded version of a way to pay your taxes. But because it's paper, it's been very expensive for the government to administer. This also incentivizes the IRS to keep this system updated each year.