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I would say ease of use and cost. A friend of mine has been using Google Sheets for years to power some small bits of data on his website. Maintaining and running his site costs nothing but the domain since he uses Netlify for CI w/Github and hosting with Google Sheets for dynamic data.

His "credits" section and song list uses Google Sheets: https://www.pontusrufelt.com

Very easy to set up a small database that non-tech people can also access. It's also a very light-weight way to implement a CMS with users and version control etc.

It's a nice solution if you don't have any experience with a database. I know this has been my reason to use it in the past.

Attempts to make web page building (a whole lot) more accessible.