And since you won't be able to modify web pages, it will also mean the end of customization, either for looks (ie. DarkReader, Stylus), conveniance (ie. Tampermonkey) or accessibility.
In case anyone thinks this is a fiction reference or something, it's not. Kinda interesting project tbh, came across someone with a Gemini link in their profile on Mastodon the other day and it got me curious.