At this point, tech's major competitors are overseas. Never thought I'd be making this argument, but does breaking up the search monopoly help America or up and comers?
Monopolies lead to no competition, leading to reduced innovation, economic stagnation, consolidation of wealth and power. That directly harms the American people and if left unchecked other countries may actually start to get ahead, especially if they maintain a fair market environment within their own country and ban American monopolies.
If the concern is that people will start using Baidu search, then the solution should be to ban Baidu search. It shouldn't be to let some monopolies run rampant with the hopes that other countries will never be able to compete, while forgetting that free market economy is what made America