Some onion sites host drive-by downloads. The famous "20 Onion Links" pastebin from 2021 contained a link to a fake marketplace that deployed a de-anonymizing exploit.
The Tor (The Onion Router) network is a system designed to enable online anonymity and circumvent censorship. Services that operate within this network use the .onion top-level domain. While these addresses are often associated with the "dark web," many legitimate organizations maintain .onion versions of their websites to ensure access for users in regions with restricted internet or to provide enhanced privacy. Understanding Legitimate .onion Services topic links 20 onion link