all the winners you choose are made today. what about the posts made in the past week. if this is the way there will be many who spam every week
SamuraiFx's post was made November 3rd. Today is November 4th.
Only valid posts made within the last week are considered. So the possibilities are much smaller compared to how it used to be. So there is nothing strange about posts selected from the same day. This is entirely possible.
Also, I did consider other posts, but did not consider them valid and moved on to select other ones instead.
Also, I do not understand what this has to do with spam. Only valid posts are considered for this contest.