Great news though I do think adblocking should be built into the browser, rather than left to extensions and 3rd party services. The internet should be taken back from AdTech agencies (Google, AdBuddy AKA Brave). Maybe add to the rumored premium version something like Nextdns?
Tracking protection != ad blocking. If browsers would always heuristically filter-out ads, this would make them useless at best, or actually deceptive. See also other comment about incentives of browsers becoming misaligned with users (or indeed Brave which you mentioned yourself).
>> Brave browser (Stage 1) is a Trojan Horse for their actual business which is a blockchain-based advertising platform (Stage 2). https://mobile.twitter.com/aral/status/1013047635253526530