When I worked in telefony abuse, like this, was pretty hard to track because of all the middlemen involved. They'd have phone banks with multiple phone numbers that they'd lease from providers in India who worked with them to rotate through outbound numbers. India doesn't allow Americans telefony companies, much less voip (in order to provide these telefony companies business), so looking at India from a telefony perspective is much like looking at several black boxes.
Tldr; because of India's policies the country of India has to do something about it. Much like Chinese knockoffs and IP theft.
I don't at all subscribe to the Friedman perspective that businesses are ethically obligated to maximize profits at the expense of literally everything else, but I do think that it's a reasonable description of the way businesses trend toward acting; an entity structurally designed for making profits will inevitably end up acting in a way that only considers that measure unless the incentives are changed, which is precisely why we _do_ need to regulate things to curtail business behavior that's a net bad for society as a whole by making it unprofitable, whether that's through direct fines or making business liable either civilly or criminally for their actions.
Pretty much everyone who communicates overseas use apps now because they’re free.
The problem is that the US carrier gets paid for terminating the call, regardless of whether it's spam or not. Why would they kill the golden goose?
de facto sanctioned by India and USA by not enforcing the law and busting the scammers