So vscode source gets updated with bug fixes found by telemetry in vscode, then vscodium gets the code fixes? That's great as a free rider approach, but if the telemetry and fixes weren't there vscodium would suffer.
Telemetry stuff is closed source so you don't see how they send the data back to their servers. It doesn't necessarily mean something nefarious. You use closed source every day. It isn't inherently bad.
That said, Microsoft has given enough reasons to mistrust them over the years that the paranoia is understandable.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.