This tweet and the replies to it have a number of excellent examples of people using Notion to host public-facing properties on the web.
Landing pages, about pages, job descriptions, libraries, portfolios, manuals, roadmaps, dashboards. This tweet thread linked to in the replies has another list of use cases with examples, including the ones above:
Some months ago we wrote about Notion as an example of a general-purpose software that optimised for nothing, and therefore was suboptimised for everything. This technically holds true.
The Notion then is still the Notion of today. But the norm around what constitutes a website has changed.
WordPress page editors like Elementor and Oxygen are fantastic, feature-rich WYSIWIG tools with which you can create highly customised pages on your site. But they are high-input, high-output tools. For sites where content and speed are more important than form, they are overkill. Even a vanilla WordPress.com site with pages may be too much overhead.
(Part 2 – So we move on to other sorts of tools)