Doesn't Lemmy do that on purpose so it's not a content-desert.
Reddit, and the internet has always had bots, spiders, web crawlers, automated aggregation services. I haven't seen any GPT style bots around.
As long as the cartoons are human made and it's not a modern style LLM/"AI" style bot that says things.
Adding to this (having just looked), all the posts I see have tags/credits around the panels so you can goto their online presence tumblrs/websites and see they're by humans.