you wrote this comment completely by your own, right? without any AI involved. And I read your comment feeling confident that it's truly 100% yours. I think this reader's confidence is what the OP is talking about.
I did. I write for myself mostly so I'm not so worried about one reader's trust - I guess I'm more worried that I might be contributing to the dead internet theory by generating AI-polluted text for the next generation of AIs to train on.
At the moment I'm using it for local history research. I feed it all the text I can find on an event (mostly newspaper articles and other primary sources, occasionally quotes from secondary sources) and I prompt with something like "Summarize this document in a concise and direct style. Focus on the main points and key details. Maintain a neutral, objective voice." Then I hack at it until I'm happy (mostly I cut stuff). Analysis, I do the other way around: I write the first draft, then ask the AI to polish. Then I go back and forth a few times until I'm happy with that paragraph.
I'm not going anywhere with this really, I'm just musing out loud. Am I contributing to a tragedy of the commons by writing about 18th century enclosures? Because that would be ironic.
If you write for yourself, whether you use generated text or not, (I am using the text completion on my phone typing this message), the only thing that matters is how it affects you.
Reading and writing are mental processes (with or without advanced technology) that shape our collective mind.