It’s a really good search engine and I have no reason to doubt their claims about privacy and cencorship but I have to say no there because beside finding piratebay in the normal search results it’s all just their claims and I don’t know of any sientific study or similar that ever tested any of the claims. If you don’t trust those promises self hosting SearX is probably a good option and I haven’t tried it in years but Qwant is another one with their own index aka independent results.
Well SteamOS is Arch based but running a LTS kernel with backported changes in a ummutable way with everything sandboxed in Flatpak so it’s quite unique but idk why anyone would want to run it on their desktop, if the immutable aspect is so interesting ro you you can try Fedora Silverblue, Vanilla OS and co. but none of those is in a state that I would recommend as “just works” for a desktop experience, if that’s the majore goal Debian or Fedora with Gnome are probably your best options.
With proper Federation the spread literally doesn’t matter so no idea what you mean with that but I agree, the none sustaiable and unethical ad format won’t be possible, no ads is something entirely different tho because sponsor segments and affiliate links would still work just as well. You are right that many wouldn’t choose that path but I am sure a lot would do so if there was a good option, at leadt a lot of the ones I like to watch but currently Peertube is such a pain to use that not even I as geek and foss enthusiast do so! :(
For everyone who is too lazy to read that too: It’s basically the british version of chat controll and aims to bypass e2ee but with even worse filters! I recently listened to a great interview that detailed the (at least to me) most scarry usecase, apparently they also want to scan for “positive depictions of arriving refugee boats” whatever that’s supposed to mean!
They literally ad d ed the tagging function on images to improve their facial detection so I doubt that this is a surprise to anyone!