Google Trends, Debian and SteamOS

I’m surprised to see that SteamOS hasn’t impacted the popularity of “Debian” as a search keyword. So far, the search frequency remains fairly fixed:

The popularity of “Debian steam” and “SteamOS” is exploding:

So its odd that there is no impact on the popularity of Debian itself. I can only suppose that the search activity for “Debian” is already very large and stable so that the impact of Steam is minimal. That’s still surprising though. I would expect it to trend up.