Porn spam is how we designate to properly indicate NSFW links on our reports.
It's gripe isn't about the content being pornographic in nature's but rather that the content is recycled from other sources vs something that adds unique value to the chain.
We've observed many accounts follow similar patterns from other categories and they are likewise flagged.
Since you don't bring up the posting frequency any more, I guess you understand the need to populate new tribes with content. And about 'spamming' the chain, barely no-one reads or watches all the content on the chain. It's all filterable by frontends, tribes and tags for specific groups. Adding unique value to 'the chain' is not a thing, perhaps one could be adding unique value to the specific tribe by recycling content that is barely available on the web any more and considered valuable enough to preserve and show? Sleep on it and see the other side also. My main arguments are all presented, correct tags to provide content for a specific group of people. That's the nature of Steem and tribes.
Flagging is your right but don't act righteous about it.