How It Works
A user picks a template, fills in text and images through a visual editor, and Squarespace handles the hosting, security updates, and SSL certificate. There are no plugins to maintain and no servers to manage. The owner pays a monthly or annual fee and the site stays online as long as the payments continue.
For a photographer, a small portfolio, or a business that needs something presentable quickly, that simplicity is the appeal, and the templates are well designed.
Where It Falls Short
The template is the structure. Customization is limited to what the editor and the template allow, so the business gets fitted into a design built for everyone, which is the Shoehorn Mentality in its most polished form. Technical control over things like heading structure, schema markup, and page-level settings is limited to what the platform chooses to expose.
None of this makes Squarespace a bad product. It is a general-purpose platform, and general-purpose platforms trade control for convenience.
The Ownership Problem
A Squarespace site cannot be moved to another host as a working website. The platform offers a limited export of some content, but not the design, the layout, or the site as it runs. A business that leaves has to rebuild, and a business that stops paying goes offline.
The domain is a separate question. It can usually be transferred, but only if it was registered in the business owner's name and the owner can get into the account that controls it.
Why It Shows Up In Ghost Developer Stories
Because a finished-looking Squarespace site can be built in a day, it is a common platform behind the Ghost Developer pattern. If the developer created the account under their own login and the developer disappears, the business owner may not be able to reach their own site, their own billing, or their own domain.
How To Check Your Own Situation
Find out whose email address is the login for the Squarespace account. Find out whose name is on the domain registration. Find out who is paying the bill and on what schedule. If the answer to any of those is someone other than the business owner, the business does not control its own website.
The Foundation Connection
A Digital Foundation depends on the business controlling the assets it depends on. Squarespace can host a perfectly good site, but the account, the design, and the platform all belong to someone else. When the website is a rental, the foundation is too.