Not quite understand.

Because the (Forum-Giveaway) @Panjul are sharing from his winning it's (Weekend Stream Forum Giveaway). To participate in this giveaway you don't need to create something or do anything. Just post your username in the post, and your account is required to have a minimum of 10 posts. Higher Chance Win mostly writes some unique from are basically same just like pick number colour.

IMO, the factor we need still the page number is your post + person who are picking winners at least aware about you. They only randomly the page they're gonna to choose but the person who are winning is being picked directly by them (not random).