For the record, Lemmy doesn't have the issue with previews that Mastodon does as it doesn't generate previews (see for example https://lemmy.world/post/19809052 for an example of preview-free link sharing ).
@defnull@chaos.social Oh absolutely, you'd need to be able to review any changes to server block lists, much like getting prompted when importing them manually.
The mock-up was mainly intended to illustrate handling of preview images for links, so I didn't really elaborate on that.