If you turn on "the Web Discovery Project" in the Brave browser, then a fraction of the web addresses you visit will be sent to Brave, even if the web pages weren't from a Brave Search SERP.

Source: https://support.brave.com/hc/en-us/articles/4409406835469-Wh...

> If you opt-in to the Web Discovery Project, your browser will process the following data on your device, and securely send it to Brave’s servers:

> - A fraction of the addresses (URLs) of the web pages visited in the Brave Browser, along with engagement metrics (how much time is spent on the page)

> - [...]