Summary: Richard Stallman gave this talk some years ago; meanwhile, a leading technical university got cracked due to Microsoft* and it won't dare mention the culprit
So Microsoft has dragged this university's computing environment down from world class to that of a year 2021 "Hillsdale College". To be sure, Oracle and Cisco also have their fingers in that pie and a role in the demise of the institution's role as one of the world leaders in computing. See "Our Attorney's Response To Microsoft" (posted by Roblimo) and this last article which brings up a very important point -- that Microsoft regards its contracts as trade secrets so even someone resourceful and tenacious would be unlikely to succeed in a FOIA request regarding the publicly-funded university's support contracts. Microsoft tried to censor information while crushing standards. Those institutions late in weaning themselves from Microsoft Windows can look at Samba 4 as an alternative.
GAFAM traps aren't "free hosting"; they herd us all into a world of tollbooths and locks, surveillance and planned obsolescence (you own nothing, you only rent)
There are many debunkings (to likely false accusations), but won't that just be another example of Windows TCO, exacerbated externally in the form of Windows botnets?