Yes, that guy and others on youtube are sadly the only line of defense we have. I'm surprised this is still happening in 2020. Plenty of Indian scam-centers were raided a few years ago.. And they're getting more and more professional at scamming, some of them have no telling indian accent (but they are sooo rude, it's unbelievable)

I am not a recipient for such scamming but I do receive phone calls on a daily basis, which I started screening of course. If I pick up and don't say anything they will hang up in 5 to 10 seconds. I think they're harvesting for potential victims.