It has nothing to do with the site being a 'tube'. It has to do with the algo.
1. Tubes Sites tend to be high traffic.
2. High traffic means more comments (i.e. new content).
3. These same sites get new "user uploaded" content daily/hourly.
In short, they have more
activity which tends to earn preference in the algo. More new content, hence rank higher. If you can get your blog website to have the same level of interaction.... posts, and comments to mirror that of a tube site activity. You would get the same kudos in the rankings.
They do not get preferential treatment because they are a tube. They get higher rankings because they generate more uploaded content, comments, and traffic than other sites on the internet. Hence they win by default. Much the way forums did in the past.
