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.
Pi holes could still circumvent this, no? At a high level you'd need a computer to load a page, strip all the garbage, and forward the remaining page to the client. Any drm keys could be retained I would expect?
As long as they let you display the site onto your monitor you will be able to manipulate what you see. This is a pointless arms race that only wastes peoples time.