you misunderstood it tbh.
it's supposed to be used as a way to skip bot verification if the requests are signed by a drm system which includes your unique id (coming from google account or google play id), and one of the goals of the actual proposal is keeping existing extension working AND keeping web pages working without drm.
of course i don't want any drm in my browser, but it's kinda already there anyway...
it will likely make the experience worse for non-drm users because they will get hit by more advanced and sensitive bot verification systems or rate limits which is kinda bad but not the end of the world.
y'all are just overreacting and spreading pure bullshit.
it's not even supposed to be used to verify DOM elements, just that the user is using an official Chrome/Chromium browser, and is not automated.
basically it's just SafetyNet.
it will not kill js addons.

If you don't want to see ads, pay for the services or use services that do not force you to download unwanted data (ads) on your computer. It's that simple.

I'm amazed at how angry people are at ads. I agree that this change would be terrible purely because of the customization thing, but people at some point are going to have to realise that there is no such thing as free lunch. You're using their service/web site, they say you have to pay by watching ads and thats the deal you have. If you don't like it, don't use it, because if ads weren't a thing, the whole internet would be paywalled (apart from the sites people host from their own cash/donations). The internet and big tech has for so long taken the stance to grow fast make money later, but many never do. I feel like the time of reckoning is soon upon a large part of the internet, where if they don't make money, they'll vanish.

Edit: just so I clear it up before anybody starts yelling at me about it, I am very much against this change for multiple reasons, but it's just that it triggered me to see so many people attacking the wrong thing. We've just become spoiled by unsustainable startup practices and have lost touch with reality.