It is outrageous, but it's not new. About 2 years ago I sold an item through the marketplace, shipped through Amazon, and at +30 days the buyer requested to return (my return policy stated no returns after 30 days). I ignored him, and then he filed a "Did not receive item" complaint with Amazon. They refunded him $250 and billed me $250. I fought it, using email, multiple phone calls (a trial in and of itself), showi…
The big internet platforms are very customer friendly and increasingly seller hostile. It is the same thing with PayPal/Ebay for example. I have no problem buying on Amazon or via PayPal, but I would never sell through them.
I worked for BrickLink for a time (a niche online marketplace for adult Lego fans) and I was surprised at how smoothly that place ran, which is actually a big reason to prefer niche marketplaces if they exist. Community, and reputation, means something there, whereas with the huge world-spanning monster markets you're just another face in the crowd, which is great news for criminals who know that police can't and won't pursue online property crime.