Hi @Silas-bue,
Following on from what @WilliamW said. One of the things we have concentrated on most with OpenFlexure is being truly open, which means not only sharing all information, but also giving users as much freedom as possible. Part of that freedom is freedom from us tracking them.
This creates a bit of an unfortunate situation, because while we believe this freedom makes the project far more impactful. Itl becomes significantly more difficult to measure that impact! Many pieces of modern hardware and software regularly “phone home” telling developers what features are being used and when. This has benefits to the development, but at the cost of user’s freedom and privacy.
At some point we may add an optional extension that is 100% opt in (because you need to install it yourself) that sends some anonymised feedback to developers. But this still wont tell us about numbers, as most wont opt in.
So how do we track impact? We have our Where Are You thread on this forum, which gives us an idea of graphical extent. We can also search and look around both the internet, and around Google Scholar.
From this we can see 100s of people are on the forum, microscopes have been built in all continents, in almost 60 countries (and this is only the countries of the people who have told us, so it ill be more).
From all of this some numbers can be estimated probably, but it will take some creativity! And will have uncertainties!