I am looking at the sources at https://packages.ubuntu.com/source/jammy-updates/dotnet6 and (as far as I can tell) they are applying a patch called 1500sdk-telemetry-optout.patch (originally from Fedora https://src.fedoraproject.org/rpms/dotnet3.1/blob/f36/f/cli-...) that is supposed to make telemetry opt-in.
There's a better fix landing upstream for .NET 7: https://github.com/dotnet/sdk/pull/25935
