alt Hacker NewsStreetComplete, as indicated by it's name, is about street data. Both are for contributing to OSM, but they are for different parts of OSM
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blargpls • today at 1:23 PM
The name probably just references the street in OpenStreetMap (OSM) as StreetComplete doesn't only collect street data as the sibling comment already noted.
StreetComplete asks about things other than street data as well. For example, I get queries about operating hours of businesses.