There was plenty of internet calling software before Skype. But it didn’t work very well, and lots of people still had slow dial-up internet connections. Plus it was called VoIP, which was a bit off-putting.
Skype was called Skype instead, and it just worked. And it arrived just as lots of people were starting to get broadband internet access.
In a conversation, you want the other person to be interesting to talk to.
Even though our influencers are quite techy, we know that even they don’t want to talk about p2p and bitrates when they’re calling their mum. (And mum doesn’t have a clue what a bit is, never mind what rate it goes at.)
So Skype has always used really simple language, and a conversational tone-of-voice.