They got there first, then as a result, they have: - a big ecosystem of themes and plugins (especially for SEO) - an army of contractors who can set it up for

They got there first, then as a result, they have: - a big ecosystem of themes and plugins (especially for SEO) - an army of contractors who can set it up for cheap, and don't know anything else - users who know their way through the UI and don't even think about looking at alternatives