Example? Archive.is is a service similar to Archive.org. In some cases you can bypass paywalls by using it. Archive.is is notorious for their anonymity.
Good to know. That reinforces what someone else was saying, that it is a bug. Since I've never actually gotten one of the links to work I really don't know precisely what they do but from what I gather I really hope they get it fixed because it sounds like a really cool service.
I think the ISP you use matters a lot. I personally haven’t had issues with it at home, but I was at my parents house the other day and it wouldn’t let me in. Started working immediately when I got home though
Important to note: for their anonymity, not yours.
Do you preserve archivers' privacy? E.g. not disclose the source IP address?
Yes.
But take in mind that when you archive a page, your IP is being sent to the the website you archive as though you are using a proxy (in X-Forwarded-For header). This feature allows websites (e.g shops or the sites with weather forecast) target your region, not mine.
source: archive.today FAQ
(archive.today is the same as archive.is, they have a couple of alternate domains)