he cannot get a residence permit for two years thats all.
After that he can join the company that he wanted to two years back.
Evey company or government has some policy which discriminates the employee.
Most of the companies have a cluase that they make you sign saying that you will not be joining their rival in case you resign from their company
for a period of one year.
NOw isnt that a blatant interference in you right?