The word "evil" is too strong, I agree. But even if people continue to use Windows, at least they could use a software with an open protocol for their communications, not something with which you don't know what some company do with your data.
Disclaimer: I'm guilty myself since I use facebook for instance.
English is not my natural language, I didn't knew that "guilt" is such a strong word. What I meant is that I say and think that it's much better to use open protocol and free software, in particular for (possibly private) communications, but that I know that it's not easy to do so when virtually everyone is using the same "wrong" (or maybe it's another too-strong word) thing. This is why I said that I'm using facebook, to nuance my comment.
Disclaimer: I'm guilty myself since I use facebook for instance.