What went wrong with Skype?
Microsoft was too busy adding emoji and trying to compete with the rise of WhatsApp, FaceTime, Snapchat, and Facebook Messenger that it had fallen short on the very basics of Skype. It had gotten to the point, in 2016, where people were using Skype begrudgingly, simply because it was ubiquitous and nothing had replaced it yet.

Skype, Close and service shuts down

When Is Skype Shutting Down? What to Know and Do Before It Closes
The death of Skype: when it closes and what you need to do
Skype is shutting down after two decades
CE-Sphere on MSN1h
Microsoft Hangs Up on Skype as It Shifts Its Focus
After more than two decades as a go-to platform for online communication, Skype is officially shutting down. Microsoft,

Skype, Microsoft Teams

How to migrate from Skype to Teams
Goodbye Skype, hello Teams: How Microsoft is making the switch easy
Why Microsoft is Shutting Down Skype—And 5 Chat Alternatives
As Skype shuts down, its legacy is end-to-end encryption for the masses
“Skype calls have excellent sound quality and are highly secure with end-to-end encryption,” Skype’s homepage read in 2004.
Microsoft Will End Skype Internet Calling Service in May
For users, Skype will go offline on May 5, when Microsoft replaces it with a free version of Microsoft Teams. Teams has been Microsoft’s chosen successor for years, offering the same kinds of video calls and group meetings.
Microsoft is retiring once-popular video app Skype to focus on Teams
Microsoft said that users will have the choice to either move to Microsoft Teams for free, or export their data from Skype.