Maybe they are expecting too much to get something because it was promised in advance via email there is something big during easter
There are 2 possibilities that they misunderstood the content of the email or were expecting too much.
I think most people were waiting for another free bonuses but in fact there is no other free bonus code during Easter, that's why they feel disappointed. I cant deny that I was expecting another bonus as well but I'm not that disappointed if there is no bonus because I did not take the content of the last email as a promise. It is obvious that they are free to express their feeling but they should also need to accept the fact what they expect is not coming.