While you may well be correct in other cases, my local intuitions led me to wikipedia's [0] references to a NYT article, which claims that the scam centers in the town they are cutting power, etc., to primarily target Chinese victims. Since the abductees and other staff manning these call centers are mostly Chinese, it makes sense their victims are too. China is rich enough that they don't need to go to the extra hassle to find western-speakers. In fact, through both local news and second-hand accounts, I know there are even Thais who get tricked and abducted to scam Thais! Scammers are just equal opportunity about their cons: even the poorest bumpkin with a positive smartphone balance is welcome to ride on their roller-coster of desire and loss.
[0] https://en.wikipedia.org/wiki/Myawaddy?wprov=sfti1#Crime
ed: deduplicate to; regret the last 28 minutes of my life.