Lets say I develop minimal contact form plugin. The plugin save contact entries in the website.
I think custom post type is not best way to store contact entries since post type is specifically created for front-facing contents.
Because of this curiosity, I installed a form builder (FormCraft) and make one entry by filling the form. The entry saved and accessible from admin, but no custom post type created. (I guess many other form builder also similar).
I wonder what type of entity contact form use?