Too bad just Internet Archive isn't enough, we also need anarchists like ArchiveTeam to actually mirror all the things, not just the things that agree to be mirrored.

Internet Archive generally allow websites to control if they get indexed/mirrored or not, via the robots.txt, so websites can decide for themselves.

Luckily, we have other grassroots movements like ArchiveTeam that doesn't care and archives anything deemed valuable to be archived, website owners be damned.