Librewolf should not be bouncing around on the Internet without the user explicitly asking it to do so.
I find this argument to be too extreme. Librewolf already acknowledges that it still needs to connect to some essential services but tries to minimizes which. content-signature-2.cdn.mozilla.net for example is necessary for OCSP (and HTTPS) to work, I’ve seen some blocklists block it in the name of “blocking telemetry” but it causes massive breakage. Just listing domain names isn’t a very useful argument.
It seems like everyone forgot that Proton (aka Steam Play) is forked off of Wine, which is a project that’s been around for more than a decade. Proton wouldn’t even be possible without Wine. That is not to discount Valve’s contributions, but it is a bit tiring to see Valve get all the praise especially combined with corporate worship.