. >> open martic kits are predicated on the idea that if a company harms people, they will choose another option. we are here today because that choice is no longer possible. >> of the four tech giant ceo ceos, jeff bezos is really the wild card. the only one who's never testified before lawmakers before. he came out of the gate swinging. he said exactly what they want to hear, which is that he thinks amazon should be scrutinized. apple ceo tim cook and mark zuckerberg took the opposite approach. they claimed or tried to claim that their platforms are not dominant. take a listen. >> we don't have a dominant share in any market or in any product category where we do business. >> our services are about connection, and our business model is advertising. we face intense competition. in many areas, we are behind our competitors. >> so the big thing that all four of these ceos want to do here today, convince lawmakers not to break them up. that's an idea that has really gained a lot of traction here on the hill in recent years thanks to elizabeth warren and the plan that she had to do exactly t