Welcome to late stage capitalism.
At least, that's more or less how I personally view it.
On the other hand, I would think that late stage capitalism would be defined when there is regulation of greed to prevent predatory and monopolistic practices that reduce competition. Or maybe that should just be called sustainable capitalism?
Fiduciary duty responsibilities are about putting the interests of the company in front of personal interests, and are mostly designed to protect shareholders. In other words, not doing things like signing up for a product you don't need just because you happened to angel invest in the company and it would benefit your portfolio. There are other fiduciary responsibilities as well, but certainly none of them are "return as much money to shareholders, or else."
Regardless, if we want this world where the government has publicly funded tax software that just works and is easy (and I personally do), the right way to solve it is through public policy changes.
Corporate leaders are expected to act in the interests of shareholders, but their legal obligations are satisfied if they can argue that their business judgment supported their chosen direction. And business judgment can consider the long term, it can consider the value of a thriving society in general, it can consider much besides short-term maximization of profit. Fiduciary duty exists only to curb overtly abusive self-dealing.
For more on this, see The Shareholder Value Myth by Lynn Stout. She has written a gloss on it here [1]. Her seminal 2008 legal review article, "Why We Should Stop Teaching Dodge v. Ford" [2], is a delight to read and I highly recommend it.
[1] https://scholarship.law.cornell.edu/cgi/viewcontent.cgi?arti...
[2] https://scholarship.law.cornell.edu/cgi/viewcontent.cgi?arti...
Maybe it also helps them realize that they have a choice too, that they are not "just following orders" from the legal system.
If taxes were simple, their predatory business model really would stop existing. There is no business justification in favor of Intuit to NOT sue the IRS if the IRS tries to make taxes simple.