Interestingly, you can. Limewire was open source, but charged for a "pro" version. (which was also open source, with the exception of some build files)

The biggest problem with all of it was that there were a bunch of scam sites that added malware, built binaries, and bought "lime wire" keywords on google.

On the other hand, I don't think OSS is to blame for that--the scam sites could have just as easily distributed any binary.