I run a small print-on-demand platform and this is exactly what we're seeing. The submissions used to be easy to filter with basic heuristics or cheap classifiers, but now the grammar and structure are technically perfect. The problem is that running a stronger model to detect the semantic drift or hallucinations costs more than the potential margin on the book. We're pretty much back to manual review which destroys the unit economics.

If it's print-on-demand, why does it matter? Why shouldn't you accept someone's money to print slop for them?

Why would detecting AI be more expensive than creating it?