Maybe you mean something else, but there are separate categories for Guild Recruitment for each platform, and you can mute the entire category, separately from the Guild Chat category. From the main forum page, click the category dropdown, pick Guild Chat, and then it will add another sub-category box next to it, from which you can pick the various Guild Recruitment categories. Pick one, then click the circle on the far right side of the page, and pick the “Muted” option at the bottom. Repeat for each of the Guild Recruitment categories, and you won’t see any of those posts again, aside from the ones that people fail to categorize properly.