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RMS' Bio | The GNU Project
Skype requires the use of a client program that is not free software; in other words, the users don't control it — it controls them.
You should never run a nonfree program, so this is enough reason to refuse to use Skype. But there are other bad things about Skype.
The author of the first article ended by bending over backwards to legitimize everything else that is wrong with Skype, such as the use of a nonfree client program, but you don't have to follow him in that.
What to use instead? The most obvious alternative is a long-distance phone card. They are quite cheap nowadays, and they work with any phone. There are also free programs you can use, such as Ekiga, Mumble, Jitsi and more.
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