I suspect that they don't actually maintain the permanent library, but rather a formatted view of the content that used to be there. Some of the sites I have the URL saved have transitioned to paywall and/or merged, goes offline or disappeared for some reason, so I can't actually read many of the links I exported from it. Though for the one that actually catches interest, I'll look for it in archiving service, but it's a tiresome work to search for it one by one.
I still don't get over the fact Mozilla bought it and shattered it less than a decade later. Perhaps it doesn't make enough "impact" to justify their time and resources, and if this behavior subsists, I would be more discouraged to give them money ever again.
The permanent library was strange. Not very transparent what happened there. I am still shocked they did not invest in the original idea (tag and archive web page), but instead tried to build another content stream with recommended articles and such.
I still don't get over the fact Mozilla bought it and shattered it less than a decade later. Perhaps it doesn't make enough "impact" to justify their time and resources, and if this behavior subsists, I would be more discouraged to give them money ever again.