Yes, almost every country in the world has restrictions on this. For example in the case of employment, with a contract stating that you have to work for life for a company, you can easily challenge it in court since it is more than obvious unconscionability. But the limitations on 'freedom of contract' by the us government never made or make the contracts businesses went into with amazon illegal or contestable.

There is no such thing as 'operate at the expense of others' in this case. Again, nobody forces you to buy at amazon. There is nothing illegal with setting requirements for a seller, e.g. not selling at a discount elsewhere. If you do not wish to sell on amazon you can freely choose to sell at any other store. If one is whining about not having the same reach: Nobody has the right to challenge amazon for just being good and demand anything from them. There is no law that gives you the right to be able to do business 'in the land of amazon' at conditions that please you.

Amazon is a private company. The FTC is treating amazon exactly how many people wrongly see it, as a sort of common good - quote:

'Amazon is a monopolist. It exploits its monopolies in ways that enrich Amazon but harm its customers: both the tens of millions of American households who regularly shop on Amazon's online superstore and the hundreds of thousands of businesses who rely on Amazon to reach them.'

(https://s3.documentcloud.org/documents/23991590/read-the-ftc...)

Bureaucrats.....Good luck proofing 'conspiration to monopolize'???. A thing which is not even possible in a free market society. The practices of amazon are in fact competitive - doing everything to kill the competition - a thing every capitalistic incentivized company who wants to become or stay at the top does. Those practices of the FTC are anti-competitive and a huge intervention, their policies is what hurting customers.