Comment by graemep

It might happen, but there are risks. The obvious one is that the existing employers will make an effort to keep the best (promotions and pay rises) so people hiring away from them will get the people they do not need to keep.

Those sorts of clauses are not legal everywhere. They would certainly be at least heavily restricted in the UK (on the other hand there are subsidies for some employer training and education here - which is why my daughter has an engineering degree without paying any fees). The author of the article is in Israel, and as an academic is in a different position to people in businesses.