This is a problem for short fiction submissions and it's not just going to go away. The link goes into details, but this is a graph of submission bans since 2019. Plagiarism and bot-written spam.
http://neil-clarke.com/a-concerning-trend/
A Concerning Trend – Neil Clarke

@clarkesworld @bhawthorne Huh! I had not heard this was a thing but it makes sense that it would show up in our current hellscape - only have to succeed a small percent of the time to make it a profitable scam.
@clarkesworld @[email protected] @rmd1023 Wonder if those “authors” are later “publishing” the rejects on that big website that sells fiction to readers and lots if other stuff.