And what if the Internet Archive falls victim to this disease and decide to self-censor? What next?

The precedent of books being illegal has already been set in many countries. Now all that is missing is the political will to have them banned (and at the rate things are deteriorating, I expect this will come sooner rather than later).

I’d also upload to Library Genesis, who previously were the storage backend for SciHub. To your point, distributed storage provides durability against censorship.

P2P decentralized protocol will work.

and you can. From what I've seen, particularly at University libraries, they'll do sales of super old worn out books, or long since outdated academic material.

Edit: In retrospect, this comment reads like I'm dismissing the parent or grandparents' concern, but really I'm just saying that you can definitely buy old stock that's been taken off shelves.