Did he say this? Seems like a really bad analogy to me. If more people are using Meteor, for example, the entire ecosystem will grow. Even if half the devs are writing closed source, they are learning a common tool and that skill lets them contribute to the common knowledge pool (eg. they can answers questions on StackOverFlow). It also creates a bigger market for Meteor developers, thus accelerating adoption.
The FSF has little choice but to consider a lot of licenses "free", but is also quite clear in the opinion that strong-copyleft licenses are always superior, and that people who do not use strong-copyleft licenses aren't really as good as people who do use them.
