@nebulon I have zero doubt about Cloudron and privacy / tracking at this stage. This is more "the other end" that I am doubtful of (Browser / OS).
And so I cannot speak for Webcatalog in details since I have not extensively tested it. However regarding the browser, this is simply due to its native config as far as I can tell (LibreWolf - "A custom version of Firefox, focused on privacy, security and freedom").
But more generally, with the toggle, I am also thinking giving the user the freedom to chose to have a different mode between Cloudron and other app/website.
Let say for example that you have an ubercool background which marries fantastically well with Cloudron's dark mode but want to keep your browser in light mode.
Yet again - and I can only speak for myself here - in the list of wishes and things I am looking forward to see released in Cloudron, a dark mode toggle is very near the bottom.