While any specific list from 2021 is now outdated (many links have since changed or shut down), below are the types of sites that consistently appeared in those top-20 directories. (Note: Do not attempt to access illegal content. This is for historical and educational context.)

While convenient, directories like "Topic Links" represent a significant security risk for both users and operators.

A common trick in 2021 was creating phishing .onion addresses that differed by one character. Always cross-check a link's "v2" or "v3" format:

Instead of blindly trusting a "topic links 20" Google document, use:

Allow a user to store, validate, and browse up to 20 .onion links grouped by topic, using a 2021 snapshot of known Tor hidden services.