>> Businesses should be required to compete and to opeerate in competitive markets.
I'm not sure I understand where you are going with this? Are you suggesting that a new product cannot enter a market without a number of simultaneous competitors?
If I want to roll out fibre to an area that doesn't have it, can I? If I want to build a fresh-produce store in a town that doesn't have one, then I need to find someone else to compete with?
Lots and lots of businesses operate as quasi-monopolies if you look hard enough. Especially in smaller and rural environments. Lots and lots of places have one gas station, one mechanic, one vet, one doctor, one diner and so on.
Your use of the word "require" seems difficult to implement. What if no-one wants to compete with me? If Apple stops making Macs, does MS have to stop making Windows?
I agree that those are challenges. Maintaining competition in markets is well-studied; I wonder what has been found - what can be done, how can the scope be limited without failing on the outcomes, etc.