anubis.techaro.lol is the home of Techaro's Anubis bot-protection project, a small but real software/security site. It sits behind its own anti-bot challenge, which is exactly what you'd expect from a product like this.
For a security tool, the important thing is whether the operators are identifiable and whether the site has a real history. Here, the imprint, contact email and a real archive record check those boxes. The empty WHOIS record on the subdomain is typical for subdomains and shouldn't be read as concealment, but it does mean the main domain's registration is what would matter for deeper verification.
If you're considering using Anubis, don't judge it by the challenge page alone. Look at the documentation, confirm the latest release matches the version shown, and check community channels like GitHub. anubis.techaro.lol reviews are sparse, so independent code review and maintainer history matter more than marketing copy. There's no sign this is a scam, but with security software, verification should always go beyond the website.