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1) I don't know what a "random" gallery is supposed to be – the misuse of galleries is about overuse, not "random" use, which suggests a bunch of images having nothing to do with the article (not a problem I've ever seen, and already covered by "Don't add images that are not relevant."). 2) WP:UNDUE is in no way specific to images. If you want to make a Wikipedia:NPOV dos and don'ts, it would warrant mention there. It's not one of the top points to put on a summary of Wikipedia:Images, since it's nowhere to be found in that guide. —swpbTgo beyond13:23, 24 August 2018 (UTC)[reply]
This is a "random" gallery. I don't think it's what you mean to prevent, since no one does this.