its been 20 years, their strategy now is to incorporate open source into their product offering
Yeah, and block as much as possible the possibility to include their cash cow (office) in open source: the desktop Microsoft Office apps are impossible to run under Linux without a VM, and the web versions are a PITA and lack many necessary features.
That strategy is over 20 years old:
https://en.wikipedia.org/wiki/Embrace,_extend,_and_extinguis...