In 2010 WordPress seemed like important technology. It wasn’t perfect, was a big and fruitful hacking target, but it had been built and refined and had a big ecosystem.
I’m not sure how and why controlling it today is seen as an important thing. It’s not irreplaceable, you could reimplement all its basic features easily in a weekend with AI, as well as the plugins and theme you’re using with it. And you could pick a language other than PHP while you’re at it. You might have your own security vulnerabilities, but anything’s better in that department than running WP.
Why do people care about wrestling over control of this particular ship?
I used to ask this question back ~2015 - I was seeing companies with massive, clunky CMS installs just so their non-technical/less-technical staff could update their websites without filing tickets to IT/dev. It seemed to be more about those departments wanting autonomy and not having to wait weeks or months for internal IT/dev to make site updates. The consensus within one dev group was that the company would have been better served by hiring someone who knew HTML/CSS/Javascript to embed with the non-technical people and edit a straightforward frontend site for them.
A lot of people know it, there are a huge number of existing installs that work well, the ecosystem is huge and not everyone wants to vibe code replacements.
It is very empowering for people with limited skills.
Why would you have vulns if you vibe coded it in a weekend? Just tell it to not have any security vulnerabilities. Boom!