I wonder if anyone has ever critically evaluated the methodology used by W3Techs [1][2]:
> We investigate technologies of websites, not of individual web pages. If we find a technology on any of the pages, it is considered to be used by the website.
> We do not consider subdomains to be separate websites. For instance, sub1.example.com and sub2.example.com are considered to belong to the same site as example.com. That means for example, that all the subdomains of wix.com, wordpress.com and similar sites are counted only as one website.
So if Microsoft has a wp.subsite.microsoft.com subdomain, W3Techs considers WordPress as part of the technologies that Microsoft uses.
Is that really 43% of the "relevant web"?
Personal blogs are a vanishingly small fraction of that. The only reason it might seem otherwise is due to social bubbles or interest bubbles.