I think it's a mix of things.

Some people are lazy but properly embarrassed after they're caught, others are idiots, still others have no conscience with which to be bothered.

But it can't be ignored that AI companies shout to the world in their massive marketing campaigns that they'll save you so much time and effort, and then whisper much later we might get some things wrong, check the output. But it's obvious they want everyone to think it works well now.