Proprietary software tends to have malicious features. The point is with a proprietary program, when the users dont have the source code, we can never tell. So you must consider every proprietary program as potential malware.
Richard StallmanIf in my lifetime the problem of non-free software is solved, I could perhaps relax and write software again. But I might instead try to help deal with the world's larger problems. Standing up to an evil system is exhilarating, and now I have a taste for it.
Richard StallmanTo be able to choose between proprietary software packages is to be able to choose your master. Freedom means not having a master.
Richard StallmanYou know, if you were *really* going to starve, you'd be justified in writing proprietary software.
Richard Stallman