Question: if personalized ads are so great, why can’t I just go into my google account’s settings and put there all the info about me? My income, my interests, ages of my children, my favorite food… Since personalized ads are so good every google users will just fill it in to get the best ads possible, right? Why not give people this option instead of implementing all this trackers?

Because everyone in the game is making money off those trackers. Just because you give them your address and general interests doesn't mean they know you're shopping for a new fence for your house or different daycares for your kids at a specific given time.