Comment by Phemist

I also installed Brave on my partner's iPhone and I agree there are no big qualitative differences in the blocking.

Probably for Google the easiest way to keep 3rd-parties from integrating native ad blockers is through licensing agreements for new code/modules in chromium. At this point there will be a fork of chromium, taking the latest non-adblockerblocker-licensed version and the two versions will start to diverge with time.

My point however was not that Google might one day block 3rd-parties from integrating ad-blockers in their own chromium variant. My point was that building on the chromium-base will improve the chromium-base, which will improve Chrome and additionally allow them to claim they haven't monopolized the browser market.

Genuine incompatible-by-time forks of chromium are not in Google's interest and thus Google needs to balance their competing interests of maximizing ad revenue, but also keeping Chrome a high-quality product and not being seen as a browser monopolist.