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I just wanted to add to this, in SEO's presepective, if you have one big site then you will only need to build backlinks for one site.  On the other hand, if you have multiple sites, you will have to build separate links for each site which causes more work and more complicated to manage. In addition, freshness plays a role in SEO; therefore, if you have a big website, you will have more topics you can create contents for which means you can frequenly update your website. Of course, there is always some cons.  If the big site falls, all of them falls together.