I really do not know. But what I can say for sure is that during the installation of Debian, it allows you to choose the desktop environment at installation time, so you can have your Debian with KDE at minute 0 after installing it.
On the other hand, remember that Kubuntu is derived from Ubuntu. I don’t see Ubuntu fans very enthusiastic about creating another Debian-based distro with KDE preinstalled when they even offer it (live images) to you here.
I’m not going to refute this because it seems to me that article are right in several points. Also, we have to be honest, Mozilla is kind of stupid sometimes.
But if you care about the default search engine or privacy settings, you really just need to do some hardening and tweaks to make it very private in general. Chromium doesn’t have any of these settings, it even doesn’t have RFP btw.
Looks like you can download Firefox through the Mozilla’s official HTTP/FTP repository that doesn’t trigger this ID token generation. Also this article motivates people to download Firefox installer from Softonic’s page:
Softonic have a really nice and privacy respectful privacy policy (obviously that’s not the case) in contrast with randomized pretty anonymous unique ID triggered by Firefox installer download. Mozilla’s generated ID feels more like a download counter than a tracker indeed.
I’m not trying to justify the Mozilla’s problems. They makes silly things sometimes, but being realistic, they do a better job taking care of their users privacy more than Google or even Brave.