I wouldn't trust a VanitySearch site that isn't made by me or WhyFy.
The issue is more about who creates the site rather than what is used to create it.
It will be difficult for me to know who I can trust. Just a small search, I can get many search results related to Vanity Search. Most of them are open source on Github. I can't even tell which one is safe or not. It is possible to scan the file before installing, but there might still be vulnerabilities like this subject, right?