It depends on your moral system. Lets say it's Mirosoft pushing a server OS, Windows, saying it's better than UNIX's in every way. Definately worth the money. Then we find their Hotmail service runs on FreeBSD for better reliability & performance. I'd say what they tell customers about Windows Server was fraudulent in that situation and they need to get off FreeBSD if they really believe what they preach.

Something along these lines for companies pushing proprietary software and patent suits as good for innovation/productivity while using non-patented FOSS for own innovative or productive projects. It's dishonest. Although, I recall the Hotmail incident actually happening and they had to switch over lol. Same when people found out Microsoft ran on one AS/400.