I use IntelliJ for $dayjob, and while I love it, it too submits telemetry. I do not know how pervasive it is, but the controls for it are not obvious in the general config window.

The only way to really escape telemetry today is a local firewall that can block network access by application.

I would like to see some analysis of the telemetry Jetbrains sends and whether you can turn it off. It's a paid pro IDE so it wouldn't surprise me if you can really disable it because some commercial customers will not want telemetry. In high security environments it's often considered bad due to the possibility of accidentally exposing secret information.

Yeah, I almost mentioned IntelliJ, as an IDE it's almost unmatched.