Welcome on sg :o)

It give big differences between users that comment different GAs, at different times, with the same, a similar or a different comment and autojoiners with activated thanks script that spam the same message to multiple GAs in the same second, anytime they are online.

It give more evidences but i will not reveal this things because such account would optimize then against the stuff that i catch them with.

I recommend, in general, that you only write thanks when you win a game OR when you write something special, as example about the game that are gifted away or something that is written in the description, and not only a thanks in each and every GA that you enter, or some people will blacklist you because they will assume that you are a autojoiner account.

To show you how extreme infested sg is....
From the comments here in this GA are 10 from autojoiners, and partly multiaccounters on top, that i know.
I am, sadly, not allowed to name them or i would be punished because of the "calling out" rule. And the bad joke on it, i would be punished harder as the autojoiners.

So you see how low the ammount of comments from real people are.

I want to advice that you set a minimum level for your future GAs, i recommend min. level 2, because each one that gave one, not free, game is, at least, level 1.
Easy solution to hold the worst rulesbreakers, win resellers, autojoiner user and bots outside (40% of the level 0 accounts have infractions for unactivated or multiple wins + the ammount of used autojoiners are much more as in higher levels).
And besides that it lowers the cases of problems with your winners.

You can check accounts/your winners with:
http://www.sgtools.info/activation
http://www.sgtools.info/multiple-wins

If someone have red marks there request a reroll and put the link(s) into the support ticket.

https://www.steamgifts.com/stats/community/users
Scroll down to the bottom and look at the "per level" info and you see 970k are level 0, only around 165k have a level, 113k of them are level 1. So around 15% of the members from sg gave something and only 4% gave more as 5 games.

Infos and tests, made from a other user:
https://www.steamgifts.com/giveaway/2RCI0/werewolf-the-apocalypse-heart-of-the-forest
https://www.steamgifts.com/giveaway/Q0WKE/farnham-fables (The interesting stats)

Have a nice day