One of the reasons relationship advice subreddits suggest divorce so often is because most people with "small" problems in their relationships don't write an essay about it on Reddit but are able to solve them with the tools/friends they have. So a Reddit post existing indicates the relationship has serious flaws.
This is not to defend the study, because asking AI has a lower barrier to entry.
No, a Reddit post indicates whoever posted is fishing for large scale validation from internet strangers. Their relationship may or may not even exist. Most of the posts are pretty obviously fake. Just like 90% of interactions in general on Reddit these days. That site should be taken out back and put out of its misery.
But nothing wrong about that. Some decisions are to made in a hunch. Even a therapist doesn't suggest to divorce or not. Victims are often not in a state to decide. They need support (as myself).
Humans often don't help. They often suggest - everyone goes through pain. It is part of life blah blah.
This is not to defend the study, because asking AI has a lower barrier to entry.