When developers evaluate new technologies, one of the elements they often look at is the size and strength of the community surrounding that technology. “Can I get help and support from peers when needed?” It’s one of the reasons why open source technologies tend to be so popular. Conversely, technology vendors regularly signal their virtue with community numbers: “Our product is used by millions of developers, choose us!”
However, there is a reason to be critical of this line of thinking. The activity of a core group, or indeed the vendor itself, may matter more to get great support than the sheer number of users. Most technologies are not subject to network effects: they don’t become inherently more valuable when more developers adopt them. Even in open source projects, there is often only a small number of core contributors. Furthermore, vendors may bloat the numbers they report: deliberately, or simply because they don’t have good data available.