I guess they're going after the people who don't need a db first, then add features to support some kind of "db-lite" functionality later. They're competing with wordpress/squarespace, not gcloud or aws (mostly..) :)

See addons: https://www.netlify.com/products/

Also services like this allow you to have a "cms" which is the typical use of a db for _most_ websites: https://www.contentful.com/.

You are correct, heavy db users probably wouldn't go with a service like this :)