Dark Web Typosquatting: Scammers v. Tor March 21, 2019 https://www.digitalshadows.com/blog-and-research/dark-web-typosquatting-scammers-v-tor/
And it's worse with v3 onions: 56 characters plus ".onion". If there's any sort of risk involved, you can't just trust onion URLs that you find online (in articles or link-farms, or via searching). You must find multiple independent citations, or get them from a trusted source. And it's always prudent to test.