So I have this "idea", you know how normally most sites have the usual backend functionality, like profile, profile edit, CRUD of some thing... Well I was wondering if there is not a way to make it "granular" kind of like models that can be reused by the backend with a noSQL approach... That if selected for a site it will implement it without too much hassle... I'm not an expert here so pardon any incorrect terms... Not sure if I'm being clear insl my question... Any suggestions welcome, I don't mind researching any suggestions or guidance from someone who has accomplished this.

I wonder if there is any technical issues that prohibit the creation of open source websites.
By "web sites" I do not consider CMS like Drupal or word press, but rather entire end web site sources.

In fact anything (frontend, backend) except database content that contain user data and credentials.

Not for reusability purposes like CMSs, but simply for transparency and community development purposes, like almost any open source end application.

I agree that a web server is much more exposed than a classic desktop app, as it has lots of targetable private data and internet public access. But for some non-critical purpose this seems to be affordable in exchange of better code review, allowing a community to help improve a tool it uses, and better (not perfect though) transparency (which is an increasingly relevant question nowadays, mainly towards personal data usage).