Both the former and latter are information for writers. Neither create massive competition for writers (not that there is any law against creating competition), just FUD and better tools for writers.
https://news.ycombinator.com/item?id=37042561
Pure text statistics won't do the same.
If it's gibberish you know you got scammed, LLM texts look convincing so you don't know for sure.
https://11points.com/11-amazing-fake-harry-potter-books-writ...
It's worse for new authors, they disappear between all the AI authors.
Publishers and readers will have to search a bigger haystack to find the needle.