Free Robux, it says, but only if you claim them in the next few hours. There is a link, then a login box, and for a child who's been saving for a new avatar outfit since the last school holidays, there's little reason to hesitate. Next, the child types their username and password into a page that looks exactly like Roblox. Sometimes they are asked for their two-factor code as well, and they hand that over too, because as far as they understand it, that is what the code is for