as seen from past antitrust actions, I expect much of "big tech" to be thoroughly dismantled.
alphabet will be chopped up along business lines. Each business will have to develop its own independent ad system.
facebook will be forced to spin off their acqs and separate completely from them.
amazon and AWS will be split, obviously.
dunno about apple. at least split their entertainment businesses from their hardware businesses.
This will be a great opportunity for startups who might otherwise never would have a chance.