Linux wouldn't be integral to their business. They could also easily run wordpress on BSD, or a Solaris derivative (Illumos), or Windows. Either Apache or Ngi

Linux wouldn't be integral to their business. They could also easily run wordpress on BSD, or a Solaris derivative (Illumos), or Windows. Either Apache or Nginx specifically also wouldn't be integral, as they could use one or the other, or some other web server that works with PHP. PHP is integral to their business, but they're not using any special feature of it that others aren't, most likely (and it's not a small community, so there are plenty of people that would be affected by any one problem). Wordpress is integral to their business. If they run into a WordPress bug, it would be useful for them to have access to someone that could track it down and diagnose it. Any heavily used WordPress plugins, or custom WordPress plugins might be integral to their business. They maybe should have someone that can look into problems with those. If a million other people are using the same feature as you that might cause problems, you're probably safe letting the community provide a fix. If 1000 other people are using the feature, who knows how long that fix will take in coming? If the developer is busy, it could be days. It's a function of how important it is to a business and how rare/replacable it is.