Catalog/showroom concept. Similar to how offices have rooms for presenting selected products, this could showcase products, services, and an outline of the offering. It can also be compared to a restaurant menu, but where, for example, 3 highly recommended dishes are presented—3, 10, 15, or 25, within a certain limit. This section would also include the ability to add links and redirects. For instance, a restaurant might offer redirects to delivery service platforms. A seller on Amazon (or other platforms where they sell) could be redirected to their products on Amazon. A well-known YouTuber, after showcasing a few of their videos, could provide a redirect to their YouTube channel.
In the initial design phase, minimizing costs would likely mean that these would just be links, but as development progresses, one could foresee the integration of APIs with some services. For example, a module displaying the latest 5 products on Amazon, provided Amazon would support such a solution with technical assistance, of course. Similarly, some websites show recent posts from platform X (Twitter), for instance.
There is a number of Amazon or YouTube users, that might need just a simple website. However it should be noted that ex. Instagram allows its users to use a website adress and have a dedicated space for it, while platforms like Amazon do not.
However, the numbers of those users, might be larger, in both cases.