She worked directly for Amazon? That's the only situation I'm referencing.
I participated in a handful of other 'contest' like situations, one of which also ticked me off because they changed the process to suit their own preferences.
As in, the stated process was pay $40 (or $90 for 1 page of feedback), 3-5 finalists would be selected, brought in for interviews, and from there up to 3 winners would be chosen. What happened? They got so many submissions that they broke out 5-7 different categories and had lists of 10 finalists within each category, and were going to move to some other kind of judging platform (social media votes?) in order to continue to narrow down to the eventual 3-5, then winners.
That doesn't fit the definition of a scam, but it certainly isn't abiding by the rules. I didn't bother with any charge-back on my card, but felt pretty tempted at the time. "Contests" for art, in my experience, tend to be a waste of time and money unfortunately, because the enticement is so damn strong.