That's an assertion, not a statement of fact. Pricing in natural monopolies is a mature subject, and public utilities have been a thing for over 100 years. Also, pricing for medical procedures is regulated in Europe, and it works extremely well.
Setting prices where you could just have a functioning market has historically been well proven to lead to disaster. Look at any communist country. The GDR ended up allowing luxury stores that were not price bound and they were a huge hit for a reason.
It does not work “extremely well” at all, it results in shortages and wait times exactly as you would expect from economics 101. I’m speaking from personal experience having been through it myself but feel free to look up how many Canadians go to the US every year and pay out of pocket for more evidence.
Black and white oversimplification that muddies the water.
You really can't think of two companies with incredibly different levels of "greed"?
There are a lot of rules whose de facto consequence is to prohibit describing the true reason someone is doing something instead of actually prohibiting them from doing it.
1. company decides to push the boundaries of the socially acceptable when it comes to cutting corners (e.g. screwing their customers, or employees, or environment, or debtors)
2. People don't like it, but rationalize this as being a natural consequence of incorporation and the profit motive. Hence while they grumble, there negative impacts to public perception don't actually cost the company as much as you might think
2b. Even if there's a boycott, there will be vocal minority that thinks it's all a bunch of whiny <target audience we're better than>. They'll actively harass or undermine said boycott or backlash, even if in a purely egotistical sense their interests are actually aligned with the boycotters
3. Social norm is reset; we all collectively expect even less from companies. That doesn't however mean the new norm is better or maintained, because as soon as there's some new major conflict between short-term profit and maintaining a decent reputation in public, we go back to step 1 from the new, lower baseline.
Stuff like increasing partisanship, and decreasing incentives for journalist (whether profession, citizen or influencer) to maintain their professional standing (as opposed to targeting clickbate) probably smears those gears nicely.
Many companies have historically clearly paid well over the odds to maintain their reputation, and done well doing so. It's just not true that nihilistic short term greed has always paid; obviously it didn't and still doesn't really. It profitable to do the little, but simultaneously also to do as many cheap things that materially affect public standing as possible.
By promoting the profit motive past a merely utilitarian means to an efficiency-optimizing end into a matter of national identity and point of distinction vs. in particular the USSR, we've shifted our culture beyond what's really rational. We (as a society) don't merely respect and understand the profit motive; we see it as a sign of merit - and significant enough merit that "winning" on that scale excuses a lot of other bad behavior.
All companies are greedy. That's the reason for existence. Your point that monopolies and oligopolies need to be crushed is very valid though. I wish more mergers were rejected in the first place.
Regulating prices is a recipe for disaster though.