Just because you talked to one (or many) who chose the job freely, doesn't mean the ones in SE Asia are the same...

The captive ones do the scamming via text anyway, and they'd get beaten or worse if they don't do as wanted. "Just send some coded message", your incompassionate mind might say.. sadly not everyone is as wise as you, and it's hard to be so when they can cut your head and throw you into a river in a lawless part of the world.