After discussing this with a close friend, he told me that is a common
practise in order to work harder? Is this true? Does this work as a
When I've hired interns, I made it clear up front that there were no promises for future jobs.
That said, we often did hire promising interns into entry-level positions, once they finished their education. Word got around, and I know we became knows as a "place that might offer you a job".
I never expected or used that as a carrot to motivate the interns to work harder. They mostly worked hard anyway. And the ones who worked particularly hard got a great review from me at the end of their stint, and a promise to help them in any way I could once they graduated. I hired some, brought some with me to other companies, and gave great references for the ones I wasn't able to hire.
While I suspect it does happen, I don't know anyone personally who hires interns and lies about the possibility of a job in order to "motivate" them. I suspect word of that practice would get around and potential interns would be warned to stay away from companies who tried that. So it might work for a short while, but in the long run it probably wouldn't.
As far as I can tell, this isn't a common practice in my part of the world. In might be different elsewhere.