On the other hand, an insider build is a beta, the only purpose of this is specifically to be able to get telemetry to detect issues before releasing.
They could just ask for feedback, which is what I naïvely considered the "insider" build for—obviously Microsoft is just spying on you for some reason.
Again, if you don’t want telemetry, don’t use the build Microsoft uses specifically to collect telemetry.
Don’t complain that the build MS uses only for telemetry requires you to provide telemetry.
Not my problem. Sounds like a problem for a company with a QA team.
Insider build is very clearly targetting people that are ok with potential bug and instability and that are ok providing telemetry to Microsoft so they can improve stability.
You are not one of those people, and thus shouldn't use it.
For example: https://discussions.apple.com/thread/251380226 Okay, you can’t send email? Well, did you delete the built-in email app? Do you have your email account set up?
Telemetry aims to fix that by providing context to what was happening when the problem happened. Whether it actually helps software development, I can’t answer.
The point was that Windows 10 2004 is RTM but you have to be a MSDN subscriber to download it, or find some shady Russian website to get it from.