Earlier quoted context omitted.
Maybe I’m taking you too literally here but none of the bills in the article talk about splitting companies up. The bills mentioned limit acquisitions of their competitors, increase funding for merger investigations, require data portability, limit self-preferencing on platform, and limit self-preferencing across business areas. At least this is what is stated in the article. I have not read the bills.
"Breaking up big tech" or "throwing monkey wrenches into their gears" is related enough that it might be worth paying attention to the OP's overall point - we're applying these rules only to American companies which will automatically a) help Chinese companies like Tik Tok compete against Facebook and Snap, and b) disincentivize them from opening US offices. Why isn't there a 6th bill saying something like: "because…
With respect to "breaking up big tech" and it being harmful to US companies on a global stage, my guess is that over a long enough time period monopolistic companies tend stop being innovative since their motivations in how to derive profit shift. I believe that will end up being harmful for the societies and countries they exist in. Countries, societies, and industries which can stay competitive I think would benefit in the long run so long as they are not consumed by that global monopoly. In the short run it could be pretty harmful.
Just an opinion I'm not too strongly tied to at the moment. It would be interesting to see an economic study or something.