Because for a CS degree students are expected to work with other systems and the software needed to complete the course work is usually low level. Even when I did my CS degree 20 years ago our labs were Linux and Solaris.

For other degrees you need software which only runs on Windows.

It might also help that Microsoft was totally irrelevant in the professional world in the 80s.

I am pretty sure you wouldn't have touched anything from google and meta as well.

I did a 4 year degree in earth science minor in CS graduating in 2019 and had to touch microsoft for arcgis in one class, and an excel spreadsheet in another.

Like yeah if you have a lot of pre-existing infrastructure migration can be a pain but MS is not in anyway necessary.

It was much easier in 1980's, unless you would be using CP/M or MS-DOS.

Students go to university to get an education and obtain employment. All larger employers use Microsoft. Universities would be failing students by not giving them an education on their technologies. Microsoft gives the Universities and their students steep discounts or free software to propagate this.

When I did a 4 year stint in college, nobody had ever heard of Microsoft.

And surely nothing has changed about the world in the last 40 years

same for me in the 2000s

unfortunately the university has gone full MS since then