Brave even openly admits this in that blog post announcing their support for native CNAME uncloaking- > In version 1.25.0, uBlock Origin gained the ability to

Brave even openly admits this in that blog post announcing their support for native CNAME uncloaking- > In version 1.25.0, uBlock Origin gained the ability to detect and block CNAME-cloaked requests using Mozilla’s terrific browser.dns API. However, this solution only works in Firefox, as Chromium does not provide the browser.dns API. To some extent, these requests can be blocked using custom DNS servers. However, no browsers have shipped with CNAME-based adblocking protection capabilities available and on by default.