Earlier quoted context omitted.
It's far more likely that Chrome's ad-blocking feature will be similar to the implementation of content blockers in Safari (introduced at a WWDC 2015 session)[1][2]. The new model for content blockers in Safari is faster and a lot more memory efficient because they're compiled into byte code. Content blockers are also more secure and better for privacy because they have no knowledge of the browsing that users are doi…
It's pretty clear that Google's strategy is that making the web better for everyone and everything is what will grow their ad business long term, rather than violently shoving as many ads as possible into their users faces as fast as possible. It's also pretty clear that they are capable of pursuing a long term strategy over chasing short-term cash.
FIFY.
I have no idea why the belief that "what's good for Google is good for the internet" persists - those days are long past. Google is best understood as a huge surveillance operation with bait services attached.
The obvious reason for them to push their own ad blocker seems most likely; it is to suck the oxygen out of the space by exploiting their privileged position as a browser maker to destroy 3rd parties that can block their ads. The ad blocker-makers are tiny, fragmented and unfortunately muddled with some crappy products that sell whitelist entries; this is a good time for Google to try to knife them, before a market leader emerges.