IMO they're referring to something entirely different, one group specifically are the fraudsters on Instagram who claim they can "flip your money" for you and "turn $100 to $1000, $200 to $2000, etc." They post pictures of themselves with large stacks of cash, designer name goods, etc. to entice people and use secondary/tertiary accounts to thank the original poster for their help, seemingly confirming the legitimacy of things.

Search "instagram money flip" on Google and you'll see a whole host of results. This has been going on for a long time now, with VRs, GDs, and any other reloadable prepaid card that you can liquidate with the PIN.