I speculate, and the conspiracy theorist in me believes, something of a compromising nature has been archived and they want that data inaccessible, but at the same time, pointing out what they want hidden would shine a light on it.

It is even more interesting the US government is coming after archive.today at the same time, or maybe that is just a coincidence, and this is just a tech-savvy philanderer trying to hide something from his wife.

This seems to me to be the most likely explanation. Someone important and/or rich wants something memory-holed and the archive sites are amongst the last to contain the content, so someone else is creating a facade organization as an attempt to get it taken down in every way possible. And yes it's entirely possible that the archive sites have multiple "enemies".

I doubt it’s one thing. People in powerful positions need the ability to control the narrative and gaslight the public on an ongoing basis by disappearing content. Being able to call them out on it breaks their system, so they’re trying to fix that.

If we're speculating, there is another reason to censor archiving site - if you recently committed well documented genocide and want the evidence erased. Given the systematic removal of such content from social media, it would not be surprising if this was related.