My response was as a consumer - specifically to social media and its ancillary products and services. So in that regard I don't owe anyone, anything.
My response as a business person is I can't personally innovate at scale and keep the level of service I feel comfortable offering. I'm an expensive lawyer that likes to provide intense levels of customer service. I fail often but succeed more often. I cannot scale that. Too many competitors don't give a fuck and too many workers don't give a fuck. other business endeavors similar - own several small businesses that are growing, can grow but will always be small compared to public companies. high level of customer service, not scalable to intense levels because of that. so I probably succumb to the tragedy of the commons in a form of I can't make it much better so get mine while I can without sacrificing too much of my morals.
As a side note, I don't think fiduciary responsibility is the right term, though I get what you mean, it's frankly more corporate ethics. Once upon a time a fiduciary duty meant some level of "do the right thing" but it's not more like an unfettered, consequences be damned "loyalty pledge". Fiduciary responsibility, is oddly the problem, and the fiduciary responsibility is to profit unfortunately. In terms of governance, corporate ethics is where the innovation needs to occur.