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.