AFAIK it uses several engines (DDG among others) with which it ssearch the relevant information, using a own index of reliable sources. As said, I use it almost since the beginning because of it’s really good privacy, good results and reliable answers. It’s not a good ChatBot, it’s what it is for, as a search assistant, capable of summarizing and explaining content to specific questions and it does it very well, with links to all sources for further information.
Online privacy is synonymous with security. Leaked private data, including passwords, banking and medical information, which has already occurred on multiple occasions, demonstrates this axiom.
Many of these 4598 Fakebook friends may surely be interested that your home is empty because you are on vacation in this wonderful beach hotel.