users is a finicky metric. When Palia came out, a game you most likely have never heard of, I wrote a desktop installer for it with Druid, which a few million people downloaded and used to install and run Palia. Only a handful of people worked on this codebase, maybe three or four while I was there, but principally me and one other engineer.

The more salient metrics would be things like how many people know how to use the framework, the variety of use-cases its good for solving, how easy it is to hire or get help with it, etc. As for Druid, Druid is already officially unmaintained, its core developer having moved on to work on Xilem instead. (my experience, for the record, was positive, I very much enjoyed working with Druid.)