>From what I have read (few personal experience) I find it difficult to use the landuse-key for this, because it implies to me that the area is mainly used for open defecation (and has significant extent). If this is what you want to describe, the tag is fine. In many other cases I believe we would rather need a property like open_defecation=yes which can be added to other objects, e.g. landuse=residential.
Cheers Martin
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