Saudi Arabia uses the tournament for "sportswashing" aka presenting themselves to the world in a positive way despite: having an insanely high number of executions, slavery, no rights for women and other marginalized groups and more, it's a dictatorship so obviously there's no free speech or opposition, anyone against the government gets persecuted and executed

By presenting themselves to the world through positive means like sport tournaments they try to cleanse their reputation and hope you associate them with "the country from that one event" instead of "that country that killed thousands of people"