[rsync]

"I thought of it but Hacker News posts are pure text, you can't add a single picture."

... which is, in my opinion, an overlooked and extremely powerful filter.

[PaulHoule]

It's a great way to reduce the moderation burden.

If people can upload images people will upload atrocity pictures (with the caption POST A STUPID IMAGE MEME... U DIE!), lewd pictures, CSAM pictures, and other things that will waste your time to manage if they don't get you in trouble outright. (It was super easy to get a basically G rated site demonetized with a 10⁻⁴ fraction of problem images ten years ago, it must be much worse now.)