This is mostly just a curiosity question. I've had quite a bit of experience building long term Web 2.0 networks and a couple months ago started building a PBN from scratch (meaning without using expired domains). But so far I'm not really seeing the difference. For example, my understanding of creating a PBN is to create a handful of blogs, let them age, handwritten articles added weekly, multiple pages, images, videos, then when it's fully formed, drop an article with your link. Then juice them up with quality links and build DA/TF. But when I build web 2.0s for my tier 1 backlinks, this is exactly what I do. So what's the main difference between them? Is it just that I've been building PBNs the whole time without realizing it? Or am I missing something critical?