The problem with your assertion is that it postulates that the winner got to where they are based on a truly level playing field.
Thats not even close to the truth.
To cite high level examples, amazon got to where they are by exploiting loopholes in sales taxes that they dodged for decades and taking advantage of USPS subsidies. And later taking advantage of international rate subsisides.
Virgin got huge by literally selling records with no stamp tax.
Im not fully versed in apples track record, but im willing to bet apple likely exploited labor laws, political favors, corporate liability shield rules, pollution externalities etc that are not available to smaller players.
There are very few megacorps that can stay by claiming to have a superior product and not much else.
Since unfortunately we cannot make political contributions dissappear, not eliminate all regulations that distort a truly level field...then we created antitrust..which yes is unfair and also against freedom of association but as i explained is necessary for a free society to maintain some semblance of equal opportunity.
Everything big must by definition come crashing down.
This is what happens in nature. Regs are allowing dinosaurs to live.
If you are not coming back down the rules need to kick in to do so. Kill dinosaurs.