Short answer. Yes. As long as we remember that the end goal is Freedom, co-operation, sharing and community.
Long answer. Ethics is not black and white. In this case, the most important question is By providing such binaries, are the solution providers encouraging participation in the FOSS ecosystem. OR are they encouraging participation in the propritary ecosystem.
In this case it seems to me that the GNU/Linux solution providers are encouraging adoption of FOSS ecosystem.
"And then you begin to experience what I know people are experiencing here and I certainly see in the States. Which is once you have moved somebody from IE to Firefox for security reasons, and from Word to Open Office for economic reasons. It then turns out that they are living in a free software environment, and you come along one day, and remove the operating system and put a new one underneath and they don't even notice that its happened. So that the gradient of fear of technological change, which was the real guarantor of the monopolies market power is being overcome."
Best way to lead people into the fold of GNU/Linux.
Here I will go one step further. Where ever we install windows binaries we should some how ensure that at least few systems are fully under GNU/Linux. This will definitely bring about a healthy rivalry among the OSs. My experience with clients has been that where ever GNU/Linux was installed the users are most reluctant to move back to MS Windows. By this, by the time all the people are ready for Linux we would have got some GNU/Linux sysadmins ready in each place.
-- Rajagopal CV