The labor theory of value doesn't work for documents any more than it works for anything else. If I do something that's easy for me, and it's valuable to you, you'll still want it. If I do something that's difficult for me, it will be less valuable to you, because the difficulty I have with it implies that what I produce will be of lower quality.
This is all equally true of automatically-generated documents. If they're valuable, people will want to read them. Whether it was unpleasant for someone to create them isn't a factor.
So where is this slogan coming from? Are people just afraid to admit that the documents they're getting are valueless?
If someone wants me to spend my time and attention on something they have shared, I would like them to demonstrate that they put a proportionate amount of time and effort into its production.
First: why? How does that help you?
Second: Is that actually true? Do you ever watch videos that a friend recommends to you? Even if the amount of time and effort your friend put into producing that video is zero? Do you ever read anything that a friend recommends? Even if they didn't write it?
How much time and effort, in your estimation, did jjfoooo4 put into producing this article on tombedor.dev?
Therefor if you are not putting human effort on the document it is low-value.
We have seen this before when big data started to be a thing, tons and tons of reports being auto-produced weekly (or even daily), but even if they contain relevant information they are low-value because no one can take action on so much information.
Your post sounds logical at the first glance, but has nothing to do with the reality. The topic title is totally on point! If the user would put human effort in it, I wouldn't get those crappy emails.