

It’s the other way around. Lync, formerly Office Communicator, became Skype for Business which became Teams, not to be confused with Teams, a distinct, non-interoperable product made by the same company. Skype for Business probably took some code from Skype but I’d bet it was mostly about branding and it never had that much in common with the real Skype.
Microsoft killed Skype in 2017 and replaced it with a different thing also called Skype.
This isn’t new, but maybe it’s been forgotten since online matchmaking. The original Starcraft could be installed as the full version which required a CD and a CD key to run, or as a version that didn’t require a CD or a key and could only by used to join multiplayer games.