There’s basically no information on the web site about the company, how they operate, who finances them, what their privacy policy is, or even how to contact them. Their “blog” is an anonymous Tumblr site.
Copyright enforcement is a lot stricter on Youtube, than say, Reddit video.
It's all down to the engagement of the IP owners.
My guess is they just haven't gotten around to chasing Archive.is down that hard.
The internet is global, it’s a choice to apply US law like the dmca. You can also choose not to.