An A.I taking a job doesn’t automatically create a new one in some kind of 1:1 ratio. That’s the entire point of A.I.

You’re (incredibly naive) example of the crane is frankly stupid because a Crane still needs to be operated. Cranes didn’t replace jobs any more than hammers did. Cranes were just a new tool to use in an existing job, Hence Crane Operators.

Now let’s turn your stupid example into a good example. Let’s say autonomous A.I. controlled cranes become a thing, and 100 crane operators lose their jobs. Now (in your brain) a new job has been created “monitoring” the A.I output (whatever you seem to think that means) but because of the efficiency of A.I. it only takes a team of three to monitor all 100 cranes.

What are the other 97 going to do…in your “simple example”?

Maybe put more than two seconds of thought into an analogy before opening your mouth.