Smartlink for Github vs Other sites

When we post a link on Confluence, we can choose to render it as a card style.

According to my experiments, most of the website rendering is pretty simple: website logo, title, description, and OpenGraph image. However, the content of GitHub link style is very rich, as shown in the second link in the picture below.

My question is whether this style is specifically designed for GitHub, or would any link display more detailed content if it meets certain standards?

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They might just exploit the OpenGraph metadata of the linked page. Example with a Github issue.

You could try with different website that expose OpenGraph data to check how Confluence render their links.