WordPress is the FLOSS alternative to Wix et al. It is the only practical software that enables people to create and self-host an online presence without having to type a single line of code, and without being beholden to a large centralized platform.
No, a static site generator that requires knowledge of Markdown and a few lines of bash doesn't count. A CMS that requires you to hire a professional to even get started doesn't count, either. It might seem strange to developers like us, but there are lots of people out there who are simply allergic to code. They can use PowerPoint and maybe even Photoshop, but show them a blank terminal and they'll just freeze. WordPress, on the other hand, can be navigated with a bunch of point-and-click, drag-and-drop, buy this and add that and change the options a bit. Just like PowerPoint, it barely works, but it works.
Very few people in our startup bubble seem to care about these "I want a website, but no code please" people, and when we do we often treat them with contempt. How hard can it be to copy and execute a few commands, after all? But apparently that market is large enough to attract a sustainable ecosystem of plugin and theme sellers. WordPress has this market completely cornered. It won't magically disappear just because it's built in crappy code. Understand the users, on the other hand, build a good alternative, and that billion-dollar market might become yours. :)