Why Linux is mostly good for big companies

I’ve found an article that puts in in clear terms that Linux is hard, Windows is easy but this guys also sorta misses the bigger picture. He says that Linux is mostly just good for large companies because you have to write your own software to take full advantage of the open-source concept.

I admin that writing your own code is a great way to participate in this technological revolution, but open-source is the doorway to opportunity for many people, not just for the elite coders and those who employ them.
It’s true that small companies would be more likely to lack some of the programming skill of larger companies, but the licensing fees on software that are pocket change to the big guys can really impact others. A small business can put in a Gentoo disk and start using Linux immediately. They can have full access to all the necessary accounting, office, and communication software that they could possibly need.

So yes, it helps to be able to write your own software, but open-source is good for the beginners too.
(Case in point: this article was written on a Suse box with Mozilla Firefox and served off of a RedHat server using PHP, Apache, and Mysql.)