I’m sure there are users on both ends of the spectrum of whether they think the telemetry provides helpful benefits or think it is spying.
My impression is most users want Slicer to “just work” so alerting of the latest version of the application or extension with bug fixes would be appreciated. I would be fine if it is transparent what type of data is being collected and having some form of auto-check being the default enabled so they have to opt-out instead of opt-in. The option to opt-out should be clear and easy to find. If it is really desired to be opt-in I would suggest on first startup after install of Slicer to pop-up warning on start to force them to explicitly define the setting of whether they want to turn on automatic checking or to have it off (with the ability to turn on/off later supported in settings).
For reference here are setting options for Visual Studio Code as it relates to update checks for the application and its extensions.
