By only profiling the top 1M sites, I wonder if this may be sampling from a set not normally distributed? I suspect the frequency of use of WordPress might go up the further down the list you go — some random blog is less likely to be on the top 1M list yet be more likely to use WordPress.
W3techs profiles the top 10 million sites which shows a percentage of 34% [1]. You might be right. [1] https://w3techs.com/technologies/overview/content_management...
"Afirman que usan una base de datos de 10 millones de dominios sacadas directamente de Alexa, pero cuando vas a la fuente no existe. Alexa solo proporcionan 1 millón."
Translation:
They [W3techs] say they use a database of 10 million domains taken directly from Alexa, but when you inspect the source, it doesn't exist. Alexa provides only 1 million.