Good work but I wonder how people even get to these domains because neither they show up in google search nor I see those names anywhere at all. Nonetheless, great work 
Google search result is personalized (country, user setting, search history, etc.) and they receive lots of request to remove website from page from search result, that might be why you couldn't see those malicious mixer domain.
Using DuckDuckGo and Tor Browser to perform quick experiment, here are the result
1. Using keyword "monero mixer", monero-mixer.to is on 1st search result.
2. Using keyword "ethereum mixer", eth-ethereum-mixer.com is on 4th search result.
3. Using keyword "bitcoin cash mixer", bitcoincash-tumbler.com/faq.html is on 2nd page search result.
So it's not that difficult to find those malicious mixer if you use different search engine or use "fresh" browser.