The Help Center has a page for What topics can I ask about here?. Part of it states:
Questions about obtaining particular datasets are off-topic (they are too specialized). The GIS site welcomes inquiries about obtaining geographically related datasets.
It seems strange to link to the GIS site but not to Open Data, which exists specifically for this purpose.
I appreciate Open Data is only in beta, but recent SE announcements make clear no beta site is in imminent danger of being culled.
Similarly, quite a few requests that get closed here are for economic data, and these requests seem to be considered on-topic on Economics SE, as can be seen from their data request tag. If GIS is linked from our on-topic help, I think it might be worth including Economics too. Perhaps something like this?
Questions about obtaining particular datasets are off-topic (they are too specialized). The Open Data site is suitable for general requests for publicly available data. The GIS site and Economics site welcome inquiries about obtaining geographic and economic datasets respectively.