Definitely don't use a free browser or a free operating system (except all the major ones are). Anything besides Microsoft Office is unacceptable (nevermind that their support is notoriously bad). Linux is open source and that's definitely been hijacked many times and caused all kinds of problems so now no one uses it except for most servers and most cell phones.
I didn't post it as the article is obviously clickbait nonsense, intentionally written to incite. It's wrong on so many levels but sometimes you have to define your opposite.