I'm honestly not sure how you could make the case that they aren't maintaining and abusing monopoly power. I mean they literally blatantly copy the designs of other companies who sell on amazon, then put their own results for their own products higher in search results than what they copied off of. It's incredibly blatantly anti-competitive.
I've found that many people will spend a lot of time and energy defending large companies (and often their CEOs) against perceived bullying. Amazon, Tesla, Elon, Meta, etc etc. I don't really understand it.
You're not allowed to complain.
I think that's a very American thing right now... politically too.
But downstream, there are lots of issues that arise if one can't expect some kind of balance in check-n-balances.