The dominance of Office is because it’s better than its competitors, and because getting businesses to change literally anything they do is near impossible. SPSS isn’t even a Microsoft product.

Also, because of the whole Open Office clusterfuck. People still download that shit not realizing it hasn't been supported in years and haven't heard of Libre Office. It leaves them thinking FOSS sucks because of a bad experience.

Most people who can't afford Microsoft Office just use Google Docs anyway.