Link previews are more often wrong than right, often showing content unrelated to the URL (not Discourse fault, I know it’s very hard to sum up the content of a web page).
Also I think it gives too much weight to the URL - a link is usually for extra info, while with this feature that link often takes 95% of the post space, which is not only unnecessary, but also illogical. What’s important is the text content on the forum, not the content on another linked website.
As an example, a link to a GitHub page includes the owner’s avatar, which is irrelevant. If you link to a release, it won’t show the text of the release, but the “about” summary of the GitHub repo, which is also not relevant. This is true of many websites actually (noticed it with Patreon articles too) - the “summary” is often related to the entire website, not to the specific page.
So since, in my opinion, this feature doesn’t work so well, I would like to disable it at admin level for the entire website. Is there currently an option for this? I couldn’t find one, but I might have missed it.