If this ad-blocking is baked into Chrome on Android and Chrome on Android doesn't get extensions, then Chrome on Android essentially has a built in ad-blocker a

If this ad-blocking is baked into Chrome on Android and Chrome on Android doesn't get extensions, then Chrome on Android essentially has a built in ad-blocker and blocks all competing ad-blockers. Chrome on Android currently has no extensions. If you want to block ads within the browser on Android, Firefox + uBlock is your best bet.