KDE telemetry is strictly opt in. Some distro like openSUSE even disable it completely. We don't nage you into enabling them. KDE is a non profit, we won't sell any data and only wn handful of developer have access to the data. We have a clear process about how to introduce telemetry in an application.
We have a clear privacy policy https://kde.org/privacypolicy-apps/ and privacy is something we really care about. See for example initiative to develop kde itinerary to be able to track your travel in a privacy councious way or all the work on gpg/autocrypt in kmail wnd kleopatra.