The Epic Privacy Browser Team is integrating uBlock into Epic in their next update and didn't find a significant degradation in performance from any Chrome limitations, nor a significant performance improvement in Brave's implementation.
Epic's mobile browsers were built on Brave/Chromium, but now that Brave has endpoint and other dependencies as mentioned it doesn't explain, it isn't possible to continue to build on them or even test them since Brave features don't work in outsider builds.
The Epic Privacy Browser is still the best if you want a Chromium-based privacy browser. Brave cloned them anyway and added their crypto and reduced the privacy. Firefox isn't recommended for privacy, though TOR is of course very good for anonymity, but Epic is better for everyday use.
Epic's mobile browsers were built on Brave/Chromium, but now that Brave has endpoint and other dependencies as mentioned it doesn't explain, it isn't possible to continue to build on them or even test them since Brave features don't work in outsider builds.