The Internet Archive, even outside of their Wayback Machine, is effectively built on digital piracy in many ways if anything. The reality is that any sort of media, whether it's physical media that was destroyed, or digital media that was deleted or had it's host platform shut down, could possibly never be accessed again unless it's archived, even if that archival was done with piracy.

Mother 3 could be considered impossible to play legally in many ways, with most of the cartridges being sold unofficially with the English ROM hack being preapplied, and the originals starting near 75 dollars on eBay, and Nintendo isn't making any money off it anymore, so in many cases unless you're a collector, it's best to just pirate the game with an English ROM translation.

The Internet Archive also has an archived online library of books that you're free to borrow from, similar to an Overdrive-like platform of sorts, which is great for finding information that isn't publicly available, or to read a book that is simply rare used and not sold anymore or where another copy isn't to be found.