What should I do about a person whose application I submitted for a job with the intention of freeing him from working in a usurious bank, but he then moved to work in another usurious bank?

You must advise and admonish your friend to leave the forbidden work in the usurious bank, and help him find permissible work. You bear no sin for his work in the usurious bank as long as your transfer is not from you, and his burden is upon him, for Allah Almighty says: "And no bearer of burdens will bear the burden of another."