MS already owned Skype for over half a decade before they made Teams and Teams voice/video chat is still vastly inferior than Skype. How would owning a bunch more IP that they‘re ignoring help?
Not just that, but you can no longer sign up for a Skype (even "for business") account if your organization has Teams through Office 365, but Teams doesn't interoperate well with Skype so if you, for business reasons, need to communicate with a Skype user without using a personal Skype account, you're SOL.
