No request has been made yet for any money for either selection, sim evaluation, training or rating. So I don't really see how it is a scam. (This may change of course later!)
Until then, surely it's best to think of it as interview preparation which doesn't hurt.
For those already flying, there are bound to be better offers and this may well be an insult to you.
For those working in McD's this is the magic open door!