A website using Anubis will respond to a request for a webpage with a free JavaScript program and not the page that was requested.
This is a legitimate critique though. Anubis requires the use of capital W Web Browsers (chromium, Firefox) in order to access the site. This effectively blocks users who A: dont want to run the computations of the JS program (which can't be circumvented due to the server side computing done) and B: users using web browsers without or with limited JS functionality that wouldn't meet the reqs of Anubis.
Anubis was created as an emergency stop valve on LLM scrapers, but I think having a solution which doesn't require Anubis is also valuable as well.
Malware is a terrible choice of words. Anubis isnt malware. It may provoke questions about the state of the Web but there's nothing malicious about protecting your digital infra when the vast majority of users browse with JS enabled and not doing so would take down your site or leave you with thousands of dollars in upkeep costs.
The FSF do give off the trot vibe and thank you for making that connection that I will never unsee. I think if they just posted what I wrote above they would get far less backlash.