ok, i did a bit more research on the portugal case. i was going off a tweet with a website screenshot, but found this verge article[1] after reading your comment; and you're right. these sites aren't "blocked" by default, the package addons just give extra data to your plan and that data is specifically for those websites. still not "neutral" (looks like buying facebook data is cheaper than general-use data) but not nearly as dystopian as it seemed.

[1] https://www.theverge.com/2017/11/22/16691506/portugal-meo-in...