A few years ago, there was a bot automatically submitting all links to archive.is and adding the archive links to Wikipedia. It got blocked and the site banned for spam. There was another discussion about it last year, and the consensus was to remove the site from the spam list so that links would be allowed again. (Not sure if that actually happened or not though.)
If you're curious, take a look at the discussions at the following links:
Those RFCs seem to have nothing to do with my suggestion.
In Wikipedia's usual frustrating manner, it's unclear to me what was even going on to trigger those RFCs or why people thought it was a problem. For some reason they were upset with links to archive.is. But why? Was archive.is replacing working links with archive links, or something?
Edit: From what I can tell, the archive.is bot was doing the same thing the archive.org bot Animats mentioned was doing. It's just archive.is didn't follow Wikipedia's policies and procedures.