What speaks against having such a tool? I'm thinking of news sites that want to give their readers the impression of the original tweet without embedding the remote content. This would've avoided the current situation where many articles are useless because the tweets they discuss are no longwr available.

Okay, maybe a bit of CSS could do the same. But this requires someone to change the CSS. Adding an image can be done by any journalist and is mostly risk-free. You cannot break the looks of other articles this way.

This, of course, is only to argue why such a tool exists.