You make the budget, they help you spend it.
You make the budget, they help you spend it.
That's the whole point of the budget, it's what you are prepared to spend to advertise. It's not greed, it's what every profit driven enterprise wants to do, spend the client's budget. It's up to both of them to make sure it's spent wisely.
Google looks at unspent budget as lost revenue, advertisers look at unspent budget as loss of potential exposure/transactions.
I don't agree with automatic opt-in, but it hasn't been proven that's even happening now.
I can see a clear benefit in using the feature, if you don't want to spend the time to manage adwords, or don't know how, it's a great way to increase your impressions without increasing your BUDGET (It could increase your spend, but it's limited to the budget you set).
Google's rank system should limit the matches to impressions which matter most, so they get paid for those ads and they increase the value and market for relivent ads.
That's the part of Auto-match that's not being discussed. If they can get more people competing for ads via Auto-match, then they can expect the price of the ads to increase due to competition.
If done well, then advertisers get more exposure to potential clients with less effort to find them, and Google gets more revenue per ad and get's the maximize the spend per client. Done poorly, they will see advertisers reduce their budgets AND their spend which will really be a blow to the bottom line. Given the results of that kind of failure, I'd expect they will get it right and most folks will profit.