To be clear, they use amp to serve pages in the protected area, but the protected content is served in the body of the page, inside an AMP-APP tag, but simply hidden.
The code is few lines long, it could have been one line, but it has to unwrap the shadow dom.
I made it for myself, but then friends started asking for it so I published it on Firefox's extension store and later on on the Chrome's one.
It's been there for a couple of years, nobody complained, I even emailed the newspaper several times to warn them about the "bug" but they never replied back.
It has never been very popular, especially outside Italy, it had around a thousand of installations and about 900 daily users, but on March this year I received a copyright infringement notice from Google, even though Google has no rights on the newspaper's content.
They removed the extension right away and banned me from re-uploading it.
I tried to reach their support many times, never heard back from them.
A few days later Firefox removed the extension as well saying Google contacted them about the copyright infringement.
As of today after at least a dozen emails I haven't been able to speak to a human being.
I don't mind much, I still use it on my systems and it still works even on Firefox mobile (for now)
I tried to upload it under a different name, but apparently I'm forbidden from publishing it again.
Weird detail: the day after Firefox removed it I've been contacted on the email I used to register on Firefox dev website asking me if I wanted to sell the extension.
The newspaper website is https://www.repubblica.it