It's a DRM middleware used to harass users of customized and privacy respecting browsers which is popular with many smaller websites.
Is that the one that shows an anime figure holding a magnifyig glass while it is checking your browser?
Please substantiate this claim. What do you think makes it DRM? What kind of browser are you using that results in "harassment"? I use tor browser and other oddball firefox forks all the time, Anubis never gave me any trouble. I think it just requires you to compute some hashes.
This is such a wild re-imagining of 'preventing uncountable AI crawlers perform DoS attacks on a whim to make line go up'
I am not sure what you are doing to get "harassed" by anubis but I use privacy respecting browsers with ad blockers and vpns myself, and anubis is by far the least annoying, almost invisible even.
In comparison I get cloudflare recaptcha on every site that uses it, sometimes multiple times per session and sometimes not even letting me pass at all due to "error".
And if the website uses Google recaptcha then I close the tab because I know it will just end up in endless recaptcha hell.