Carol Denvers was doing important stuff with Alpha Flight and the Ultimates, plus a third job as member of A-Force. She couldn't waste time with Iron Man's Garage Avengers.
OG Hulk was depowered and not interested in joining any team.
Most other Avengers would join Steve Rogers's team rather than Tony Stark's low budget team (Tony has been kinda assholic for a long time and has had clashes with most fellow Avengers... if he doesn't even have money anymore, why would anybody want to join him?).
Tony Stark's team was made of Avengers who didn't get along with Steve Rogers (Tony and Sam Wilson) plus newbies (Jane Foster, Kamala, Miles and Kid Nova) plus Vision, who has been acting weird lately.