How many of them are real? Some of them have been posting the same position every month.

Out of those that are real, how many of them are completely out of touch with what they're asking for? Whether low salary, unrealistic expectations regarding experience/skills, etc?

Out of those that pass the above filter, how many of them have unrealistic application requirements such as tech tests, etc?

And so on. Hiring is a market for lemons, with scammers on both sides.