What is the ruling on accepting the marriage proposal of a man who works as a department head in a sports betting company, knowing that his morals are good?

If the money collected for betting is paid by the contestants, then it is gambling and forbidden, and working in it is assisting in sin. However, if the money is paid by the state or another party, then there is no harm in that. Therefore, if the suitor is upright in his religion and morals, and his work in betting is permissible (meaning the money is not from the contestants), and there are no other forbidden things in his work, then there is no objection to accepting his proposal.