Windows being easy to pirate wasnt the reason for it’s popularity. It had market share because they allowed for it to be preinstalled on machines for virtually nothing. They allowed it to be preinstalled on machines for virtually nothing because the OS wasn’t the flagship product.
MS Office has always been the major flagship product for the company. This was true in 1994 and still is today. Office is so important to their revenue streams that it’s fairly common knowledge and has been mentioned by former employees that OS development would focus on compatibility with Office programs, not the other way around.
Specifically if you look at the years around Office XP and 2003, that suite is used very much as a CVS. They deprecate their operating systems using Office.
Valve argued in court that you do not own any title in your library and that they are a subscription based service. That’s not very ethical.