Mostly targeted at games with inflated Achievements counts.
Some people have all the time in the world on their hands- so, for instance, they make “fake games”, which basically exist for no reason but to help users inflate their overall Achievement count on Steam. Which is extremely funny, because unlike with Xbox Live and PSN, there is no globally applicable achievement tracker or metric on Steam to begin with.
Nonetheless, this is a problem serious enough that apparently, Valve is now taking several steps to bring it under control. According to Reddit user deliteplays, games submitted to Steam will now have to meet a “confidence metric” threshold. Until that is met, they will have a limit of one-hundred achievements, with the achievements not contributing to the global achievement count. They will also be unable to be shown in a a Steam Profile’s achievement showcase, nor will they be seen in a Game Collector Showcase. These Achievements will also not be eligible for coupons.
In other words, they’ll be pretty neutered. Now the thing is, most major games you play should be safe and exempt from this anyway- but a lot of shovelware that hits Steam might be affected by this. Games will haven’t met the threshold will be labeled, so at least you will know prior to purchasing them that their Achievements might have limitations.