Exactly my point. In Germany I can order from the smallest of webshops without even reading their return policy, because I am guaranteed favourable terms by law.

This isn't without downsides though: As somebody with a niche technical hobby, it is hard for me to order from many suppliers because they understandably don't want to deal with consumer protection laws and thus exclude B2C transactions outright ("Verkauf nur an Gewerbetreibende").

I would be fine with waiving my right to returns but this is not possible on purpose, so my only options are to shop somewhere else (often not possible) or found a company (not possible because it would be Liebhaberei - "Running a company without intent to make profits").

In the US, if the remote merchant doesn't accept a return (or is non responsive), a credit card chargeback would be in order.

The customer almost always wins those. And the merchant always has to pay a fee for the chargeback, even when they win, so they're incentivized to avoid them.

The merchant agreement isn't as effective as a well enforced law, but it's pretty close.

So the person that wants to sell that ultra-unique item that isn't produced by mega-corp, and the person that wants to buy that ultra-unique item despite unfavorable return policies never gets their needs met.