I strongly disagree on that point. Preservation of the internet is extremely important for cultural and historical reasons. Just look at the enormous amount of old websites stored on the internet archive and how helpful as well as culturally significant that preservation effort is. And that is only a drop in the ocean compared to how big the internet actually is.
Yes preserving stuff, especially video, takes enormous amounts of data and is hard but is well worth the effort in the end.
GrapheneOS has been a viable daily driver for most people for quite some time. I've used it for two years now without issue. Even banking apps and the like work apart from some very unusual cases which don't affect me personally.