So, Matt accepted articles for publication on the WordPress website that are not WP related. They are (were? The Google searches linked to don’t return anything) there for generating revenue and nothing more.
There are plenty of ways to make money doing free software, but they usually mean doing work for someone else and sometimes that code doesn’t get released. Or you rely on the goodwill of others to donate and that doesn’t happen often!
Matt’s done a huge amount of work for WordPress and I wish him well finding another source of revenue to cover his hosting costs, compensation for his time and other costs.