We used to break up companies that became Too Large. Either they became so large that it was impossible to compete against them (as Large Company can demand way better pricing on volume than Small Startup can or has way better access to financial instruments due to better ratings, or like many automotive companies even run their own goddamn bank), or because they could use a wildly profitable business to price-dump competitors out of existence or because they became so large that they felt free to extort their customers to the tune the people would complain about it in the media/their congresspeople too much, or because they became so large their sheer size represented too much economic risk ("too big to fail").
We should begin doing that again. Something as big as Google/Alphabet, Apple, Amazon, Meta/Facebook, Walmart, the Big Four consultancy shops, virtually all major banks - there's absolutely no reason these should be allowed to exist at their current size. Or, if these companies still wish to exist at their size / their existence as one platform, they at least have to be regulated to mitigate the threat originating from that scale.