When you use a URL in your post, the RIM (Random Intelligence Module) tries to change it into something more visually interesting. I hope it's not too $#@!ing annoying for you...
AFAIK, it only converts Amazon URLs to media links. Do you know of others?
For other readers
Here is an example of an Amazon URL pasted on a new line like we do with unfurled URLs:Here is the same link attached to the text description using the "Insert link" chain icon in the editor menu bar. Note that the URL is not converted to media, which some ad-blockers make invisible.
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