That's not what it means. Look at subreddits like /r/historyporn or /r/earthporn. These do not mean porn in any kind of derogatory sense. It literally means nothing more specific than "lots of content that people like". It really does not carry a derogatory connotation, or at least it is most widely used in positive ways
> It literally means nothing more specific than "lots of content that people like".
I think it's a bit more than that, something like: "lots of content that people like and will waste a ton of time consuming for little hits of dopamine".