When creating a site, just before finishing on the confirmation page, the label about whether the site shows on the public sites list says
Viewable by public.
In Site Info, the label for that setting is Included on public sites list.
Users are confused by what viewable to the public means - confusing it with public view settings on resources, thinking the entire site is open.
Please change the setting on the confirmation page to be consistant with what is in Site Info.