What do you mean by that? You can certainly write and run your own adblocker or chose from variety of third-party offerings.
You are complaining about Google dropping a more powerful adblocking API in favor of more restricted one from Chrome? No one is preventing you from using other browsers or modifying Chromium source code in whatever way you like.
You are complaining about Google dropping a more powerful adblocking API in favor of more restricted one from Chrome? No one is preventing you from using other browsers or modifying Chromium source code in whatever way you like.