> C# ( net core ) has telemetry, as well as Java

Which Java distribution? Maybe the Oracle JDK/JRE? I highly doubt the Oracle JDK/JRE has serious usage numbers because of it's (quite commercial) license.

> dotnet, vscode (Microsoft), golang (Google), Oracle JDK/JRE, Nextjs (Vercel), ...

I wonder if there's some trend where corporate backed, large "open source/source available" projects being more open to telemetry compared to more "open community" projects.

For non-corporate projects, the general thought process might be it's fine to leave efficiency gains and improvements on the table if it means violating some foundational principles. While in a business setting, those efficiency gains could be very tempting since it can translate to more money, market share or promotions and that way of thinking gets applied to the open source projects as well.

I think your analysis is correct, and would also add that corporate projects probably have both the culture of monitoring (they use it for everything else) and the expectation that they have to deadlines so they prioritize the idea of being able to ship something with the confidence that it either won't break anyone or they'll be able to know & react quickly if it does. Open source didn't used to have that same focus since it was rarely someone's job and there was more understanding that time was in short supply (“if it breaks, let me know or send a patch”).

It probably also helps there's more easy access to infrastructure for all of this: servers and sysadmins. Ignoring everything else, that's much harder for your more classic volunteer effort open source project: servers cost money, and maintaining them costs time (usually better spent on actually writing code and such).

> GCC is more used than Go and GCC does not have telemetry so GO doesn't need it is completly unrelated.

I mentioned that because an argument could be made that they're the most popular, or they're trying to be the most efficient language and that's why they might "need" this telemetry data.

> Most dev working on core tools want telemetry

Yet somehow, almost all open source, popular, efficient tools don't have telemetry. Like the ones I listed + python + Linux + coreutils + bash.

Of course they want this. But there are mountains of successful projects that work very well without it, and every one serves as evidence that this Isn't as important as they let on. We shouldn't subject our personal computers to google tracking because they want more tracking data.

In case anyone wants to mention that it's Google's language and they can do what they want with it, this is a perfect example of why people aren't happy with Google's control of the language