Unless they're out in the open where you can see them crafting, it's honestly not that easy to tell which players are using DoH bots unless they have an established history of botting in other ways (Which several players in my server's top 12 do) that are more easily identified, such as on DoL.

The ones who are using a script basically spam actions non-stop at a consistent pace and go through the crafts much quicker then an actual player would, though. I'm assuming this is why a lot of them choose to craft in places where they cannot be seen by others such as in inn rooms or their houses.