At first it sounds insane that Google would do such a thing since while ad blocking is growing, enabling the feature natively especially by default would incredibly increase the number of ads blocked.
My guess is, that where other blockers by default can easily block all google ads, Chrome blocker would not block Google Ads because it would classify them as acceptable. And Google would then hope that people would use their built in blocker rather than downloading a third party extension which would highly likely block there ads. And if people have a built in blocker that blocks the mostly bad ads, the people would start to hate ads less and be okay with 'good ads'. Also since people wouldn't use third party blockers as much those companies would go out business more likely.
It's a very risky move on Google's part, so would be a bit surprised if it happens. But doing nothing, is equally if not more risky in the long run for there business model.
My guess is, that where other blockers by default can easily block all google ads, Chrome blocker would not block Google Ads because it would classify them as acceptable. And Google would then hope that people would use their built in blocker rather than downloading a third party extension which would highly likely block there ads. And if people have a built in blocker that blocks the mostly bad ads, the people would start to hate ads less and be okay with 'good ads'. Also since people wouldn't use third party blockers as much those companies would go out business more likely.
It's a very risky move on Google's part, so would be a bit surprised if it happens. But doing nothing, is equally if not more risky in the long run for there business model.