1. I agree, Google must do something to inform users about these auto categorizations 2. I doubt they will populate primary inboxes with ads. They created prom

1. I agree, Google must do something to inform users about these auto categorizations 2. I doubt they will populate primary inboxes with ads. They created promotions tab for that so they must've thought about it long and hard. Believe me, when people like me who work in ads businesses think about introducing new ads/formats, we worry about lot of things. Ads are not about making money. Ads are about ensuring users find them useful, brands also demand that. Lastly, even if I run ad related business, I'm an average user too, I have my family who have no clue about how digital advertising works. So whatever decisions I make is important for me, my family and my users given it's implications. 3. Google axed some of the products you mentioned cause they were not sustainable for them. I doubt that will be the case for Gmail. It's most popular web-mail service. 4. No they can't as far as my knowledge goes. But someone might figure out a way to block them. 5. I was part of invite only club in 2004. And I also miss some of the cutting-edge innovations that gmail brought e.g. storage, speed, agility etc. I personally find these auto categorizations to be extremely useful. It has cleaned up my cluttered inbox. And ads are also part of it but their impact is minimal.