However, if I am visiting somewhere and the machines available nearby happen to contain non-free software, through no doing of mine, I don't utterly refuse to touch them. I will use them briefly for tasks such as browsing. This limited usage doesn't give my assent to the software's license, or make me responsible its being present in the computer, or make me possessor of a copy of it, so I don't see an ethical obligation to refrain from this. Of course, I explain that they should migrate the machines to free software.
Likewise, I don't need to worry about what software is in a kiosk, pay phone, or ATM that I am using. I hope their owners migrate them to free software, for their sake, but there's no need for me to refuse to touch them until then. (I do consider what those machines and their owners might do with my personal data, but that's a different issue. My response to that issue is to minimize those activities which involve giving any personal data.)
That reasoning assumes I was not responsible for setting up those machines or for how it was done. By contrast, if I were to ask or lead someone to set up a computer for me to use, that would make me ethically responsible for its software load. In such a case I insist on free software, just as if the machine were mine.
Skype is a special exception. Using Skype to talk with someone else means that other person must use Skype too. Even supposing my host has Skype already installed on his computer, my using it briefly would not be harmless — it would constitute encouraging my interlocutor to have and use Skype. My conclusion is: never use Skype even for a moment.
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