It does this already, otherwise all media urls or regular urls would not be rendered.
Discussion
How is rendering remote content the same as manipulating the dsta inside a signed note?
They "manipulate" it too. An image with 1200px x 1200px will not be visible in full size on your feed. Anyway, if you prefer big tech mapping your social circle, you could just keep clicking on external links with tracking links, while others would voluntarily opt out. Up to you.
If you read my commenta on the post, i literally said just use url check bc it does the same shit youre asking for and doesnt require nostr devs to do shit out of their scope.
Changing the original resolution of an image or rendering it isnt the same as actually manipulating signed data
Noted.