Simple solution in 2 clicks. When you see bot stuff in the Games section that spamms your Search, click on the "Games" sections, go to the bottom and click "Mark forum as read". Done, all topics in that section will be gone, and the next search will not show anything from there.
Yup, just noticed that in the updates thread. Good feature, thank you ! Now people can ignore the Off Topic section, and I can ignore ones like WC section, but no need yet, it's not that spammy.