after you purchased ... login compulsary
At least Personal Skype was free and MS had more or less broken it anyway by the time you could only use an MS account.
See also Minecraft, which MS bought.
When are the so called Tech companies going to be reigned in? Apple and Microsoft are Tech, but really Google, Facebook and Amazon just leverage technology.
These are shocking lists
https://en.wikipedia.org/wiki/List_of_mergers_and_acquisitions_by_Amazon
https://en.wikipedia.org/wiki/List_of_mergers_and_acquisitions_by_Facebook
https://en.wikipedia.org/wiki/List_of_mergers_and_acquisitions_by_Alphabet (Google)
The real tech companies don't have a great look either. Oracle, Microsoft, Apple, IBM, Qualcomm etc.