Earlier quoted context omitted.
The question posed by the monopolies is not "are these the only options". But do these wield too much market power to be controlled by the market. That is, sure, Bing and DDG make up 5% of the global search, but is that enough. Yes, people use Twitter and TikTok, but does that replace the social graph of FB? Yes, I can buy directly online from many places, but if people are going to Amazon instead of Google to search…
I don't know what the formal definitions of any of these things are, but I assume (hope?) that it's important not to equate being successful with being a monopoly by definition. If Ford came out with an amazing new car tomorrow, and suddenly 95% of new cars purchased were Fords, we probably shouldn't initiate trust-busting action against Ford on that basis alone. We want car companies to try to capture market share b…
There's an important difference between "capturing market share" and "capturing too much the market share." If Ford's going to put its competitors out of business, turn them into niche players, or even just get into a position where it can rest on its laurels for a few decades, our primary concern is no longer making sure Ford can be rewarded. Honestly, I don't see the downside of regularly breaking up a #1 player with too much market share into successors that are the #2 and #3 payers (and forcing major shareholders to divest one or the other). I want companies to be competing to get to the top, but once they get there, give them a prize for their effort and send them back down.
From my experience as a customer, Amazon's e-commerce operation hasn't improved much (e.g. their search is still as shitty as ever) and has arguably regressed in many ways (e.g. more shady products and fake reviews) in the last decade. That's pretty strong signal to me that they're not under enough competitive pressure.