The result: there is now effectively one dominating web browser run by an ad company who nigh unto controls the spec for the web itself and who is finally putting its foot down to decide that we are all going to be forced to either used fully-locked down devices or to prove that we are using some locked-down component of our otherwise unlocked device to see anyone's content, and they get to frame it as fighting for the user in the spec draft as users have a "need" to prove their authenticity to websites to get their free stuff.
(BTW, Brave is in the same boat: they are also an ad company--despite building ad blocking stuff themselves--and their product managers routinely discuss and even quote Brendan Eich talking about this same kind of "run the browser inside of trusted computing" as their long-term solution for preventing people blocking their ads. The vicious irony: the very tech they want to use to protect them is what will be used to protect the status quo from them! The entire premise of monetizing with ads is eventually either self-defeating or the problem itself.)
The entire premise of 'people want expensive to make websites, but don't want to pay for them' is already a bit flawed. I do pay for youtube to not see ads, I wish I could pay Google (and Meta) to not serve me ads on any site including Google search, they have ads on. That would make life a lot nicer. And I personally know no-one who would not sign up for that. But that doesn't happen, I guess because ads make more (not from me, but he)?