This point ties into the one before as it implies that you know what your audience appreciates. If you are promising them to be a Big Daddy, you have to know if that is something people want. That is why marketing research is so important for bigger game studios, as they do not want to spend huge sums creating a flop. Once they create expectations with the players they are obligated to fulfill them. Otherwise they may end with a marketing failure.
The biggest examples of broken promises that come to mind are No Man’s Sky and Cyberpunk 2077. Both games that were very hyped up for a long time and with lots of pre-orders. No Man’s Sky talked a lot about all the features the game would contain, this was taken as promises by the players, who then complained when the game released without a lot of these features. They felt cheated!
Likewise Cyberpunk 2077 had made a lot of promises, and after multiple delays and almost a decade of hype CD Projekt Red failed to deliver a finished game that fulfilled all the promises that had been made.