Come on, that is being being pedantic about semantics. They do not need to be all-in with open source to like it/love it/appreciate it.
If one believes that open source something can lead to a loss of profits, then one must believe also that the open source software they have likely used has already made that sacrifice. It's easy to appreciate the sacrifice of others but then fail to make it oneself.
This metaphor is alright for this actually.