[ktjfi]

If they constantly say they are using Skype it's because they are being paid to say so, not because they are actually using Skype (which they could be, of course).

[af16090]

They say they're using Skype because the Skype Broadcast Terms of Service require them to say it: https://www.skype.com/en/legal/broadcast/

[whisps]

It could also be that "Skype" has become the generic catch-all term for video chatting on desktop, since it rolls off the tongue way easier than "video call."