Typically only family and friends are the typical affected party of gambling addict since that’s the peer they usually interact. You already covered the most typical indirect victims of gambling addiction.

I have one time a schoolmate that is addicted on computer games gambling(betting on his game). He typically borrows money from me for his bet that he usually forget to pay voluntarily. Our friendship ended when he didn’t pay me when I ask the money and he has the audacity to het angry with me. His gambling addiction destroyed our friendship in school. I believe this is common now since there’s already online gambling but back then this kind of addiction is very rare.